California's Endangered Bumble Bees: What the CESA Listing Means for Sacramento Property Owners

California's endangered bumble bees are now protected under state law. In September 2022, the California Fish and Game Commission formally designated four native bumble bee species — the western bumble bee, Crotch's bumble bee, Franklin's bumble bee, and the Suckley cuckoo bumble bee — as candidates for listing under the California Endangered Species Act (CESA). After the California Supreme Court declined to review the case in September 2022, the listings became enforceable. For Sacramento property owners, that turned a quiet conservation issue into a real legal duty: it is now unlawful to kill, capture, possess, or harm any of these four bumble bees in California without authorization, and the Sacramento Valley sits squarely inside the historic range of three of them.

This guide explains what the CESA listing actually requires, which bumble bees are protected, where Sacramento property owners are most likely to encounter them, what counts as a violation, and the practical steps you can take to stay compliant while protecting native pollinators on your property. The content draws on the California Department of Fish and Wildlife (CDFW), the Xerces Society, Defenders of Wildlife, the published Court of Appeal decision in Almond Alliance v. Fish and Game Commission (2022), and field data from The Bee Conservatory's Sacramento County restoration sites.

TL;DR — What Changed for California Bumble Bees

• In 2019 the Xerces Society, Defenders of Wildlife, and the Center for Food Safety petitioned to list four California bumble bees under CESA — and the Fish and Game Commission accepted candidacy.
• The Almond Alliance and seven agriculture groups sued, arguing CESA's definition of "fish" did not extend to terrestrial invertebrates like bumble bees.
• In May 2022, California's Third District Court of Appeal ruled that bumble bees qualify as "fish" under the statute's broad invertebrate definition (Fish & Game Code § 45) and are therefore eligible for CESA protection.
• In September 2022 the California Supreme Court denied review, making the appellate ruling final and enforceable statewide.
• Listed species: <em>Bombus occidentalis</em> (western), <em>Bombus crotchii</em> (Crotch's), <em>Bombus franklini</em> (Franklin's), and <em>Bombus suckleyi</em> (Suckley cuckoo).
• Three of the four — western, Crotch's, and Suckley cuckoo — have historic Sacramento Valley records.
• It is unlawful under Fish & Game Code § 2080 to take, possess, purchase, or sell a listed species without an incidental take permit.

How a Bumble Bee Became a Fish in California Law

The legal path to protection is genuinely strange and worth understanding, because it determines what the law actually covers. The California Endangered Species Act, passed in 1970 and amended in 1984, protects "native species or subspecies of a bird, mammal, fish, amphibian, reptile, or plant." Notably absent: insects. For decades, that wording was interpreted to mean CESA could not protect terrestrial invertebrates.

The opening was Section 45 of the Fish and Game Code, which defines "fish" as "a wild fish, mollusk, crustacean, invertebrate, amphibian, or part, spawn, or ovum of any of those animals." In 2019, conservation groups argued that this expansive statutory definition controlled — that bumble bees, as invertebrates, fit within the "fish" definition the legislature wrote, even if biologically they are nothing of the kind. The Fish and Game Commission accepted that reading and granted candidate status to all four species.

Agricultural plaintiffs sued. A Sacramento County Superior Court initially agreed with them. But on May 31, 2022, in Almond Alliance of California v. Fish and Game Commission, the Third District Court of Appeal reversed, holding that "the Commission has the authority to list any invertebrate as an endangered, threatened, or candidate species under the Act." In September 2022, the California Supreme Court denied review. The four bumble bees became — as a matter of California law, however unusual the framing — protected fish.

The practical effect for Sacramento property owners is that on December 1, 2022, a quiet but significant change took effect: a homeowner who hired a pest control operator to spray a Crotch's bumble bee nest in a Land Park backyard was, in legal terms, doing something quite different than they would have been a year earlier. They were taking a CESA-listed species. The penalties under Fish & Game Code § 12000 et seq. include criminal misdemeanor charges, civil fines up to $25,000 per violation, and seizure of equipment used in the act.

The Four Protected California Bumble Bees

Three of the four listed species have historic or current Sacramento Valley records. The fourth, Franklin's bumble bee, occurred only in a tiny corner of southern Oregon and far northern California and may already be extinct. Here is what each species looks like, where it lives, and what its status tells Sacramento residents.

Western Bumble Bee (Bombus occidentalis)

The western bumble bee was once the most common bumble bee on the West Coast. Today, according to the Xerces Society's Bumble Bee Atlas project, populations from central California north to British Columbia have declined by more than 90% from their late-1990s baseline. The species has functionally disappeared from much of its lowland California range. ID: a yellow front of the thorax, black mid-section, and a distinctive white tail (the only Sacramento-area bumble bee with a clean white abdomen tip).

Sacramento Valley records exist from the early 20th century, but verified sightings have been rare since the early 2000s. If you photograph a white-tailed bumble bee in Sacramento County, that observation has real scientific value. Submit it to Bumble Bee Watch — the joint Xerces / University of Ottawa community-science platform that CDFW uses for occurrence data.

Crotch's Bumble Bee (Bombus crotchii)

This is the species Sacramento residents are most likely to encounter. Crotch's bumble bee is a Central Valley specialist with a current — though severely diminished — range that includes Sacramento, Yolo, Solano, and San Joaquin counties. ID: a mostly black bumble bee with a yellow band on the thorax and a yellow band across the third and fourth abdominal segments. The face is solid black, which separates it from the much more common yellow-faced bumble bee.

Xerces Society modeling using occurrence records from 1900 to 2020 estimates that Bombus crotchii has lost roughly 80% of its historic range. The remaining population is concentrated in scattered Central Valley grasslands, agricultural margins, and protected lands — including pieces of the Cosumnes River Preserve and Yolo Bypass Wildlife Area within an hour of downtown Sacramento. If you suspect you have seen a Crotch's bumble bee, our yellow-faced bumble bee identification guide walks through how to rule out the most common Sacramento lookalike.

Franklin's Bumble Bee (Bombus franklini)

Franklin's bumble bee had the smallest known range of any North American bumble bee — a 200-mile band across southern Oregon and far northern California, including parts of Siskiyou and Trinity counties. Annual surveys by retired USDA entomologist Robbin Thorp tracked the species from a peak of 94 individuals in 1998 down to a single individual in 2006, after which no verified sightings have been recorded. Most experts now consider Bombus franklini functionally extinct, though it remains officially listed and surveys continue. The species is not present in Sacramento County and never was.

Suckley Cuckoo Bumble Bee (Bombus suckleyi)

The Suckley cuckoo bumble bee is unusual: it is a social parasite that lays eggs in the nests of other bumble bees — primarily the western bumble bee. Because it depends on a host species that has itself collapsed, Bombus suckleyi populations have crashed in parallel. There are scattered historic records from the Sacramento Valley but no recent verified sightings. ID is difficult and best left to specialists; cuckoo bumble bees lack the pollen baskets (corbiculae) that other bumble bees use to carry pollen, which is the most reliable distinguishing feature.

What "Take" Means for Sacramento Property Owners

California Fish & Game Code § 86 defines "take" broadly: "hunt, pursue, catch, capture, or kill, or attempt to hunt, pursue, catch, capture, or kill." CDFW's enforcement of CESA-listed species generally extends "take" to include actions that result in significant habitat modification or pesticide application that kills the species, even where the property owner did not intend to harm a listed species. The relevant statute is Fish & Game Code § 2080: "No person shall import into this state, export out of this state, or take, possess, purchase, or sell within this state, any species, or any part or product thereof, that the commission determines to be an endangered species or a threatened species."

Translated to a Sacramento property: spraying a residential bee nest with consumer pesticide, hiring a non-permitted exterminator to destroy a hive, applying neonicotinoid systemic pesticides on flowering plants where listed bumble bees forage, or razing nesting habitat (rodent burrows, dense leaf litter, undisturbed grassland margins) during active colony season can all potentially constitute take. Whether CDFW would investigate a single backyard incident is a separate question — they have limited enforcement capacity. But the law is now structurally available, and the citation history since 2023 includes pesticide applicators and developers, not just commercial farms.

Pesticides, Neonicotinoids, and CESA Compliance

Pesticide use is the most common path to inadvertent take. Neonicotinoids — imidacloprid, clothianidin, thiamethoxam, and dinotefuran — are systemic insecticides absorbed into plant tissues, where they remain bioactive in pollen and nectar for weeks to months. The European Food Safety Authority and U.S. EPA have both confirmed sublethal effects on bumble bees at field-realistic exposure levels: impaired navigation, reduced colony reproduction, and increased mortality.

California's Department of Pesticide Regulation does not currently prohibit neonicotinoid use on residential properties, but applying these chemicals on flowering plants where a listed bumble bee forages can — under a strict reading of CESA — constitute take. The cleaner path: skip neonicotinoids entirely on bee-attractive plants. Our Sacramento neonicotinoids guide covers product identification, safer alternatives, and the specific brands sold at Sacramento-area garden centers that contain these chemicals.

What Sacramento Property Owners Should Do Instead

• Read pesticide labels for active ingredients before purchase — "bee-friendly" claims on the front of the box are not regulated; the active ingredient on the back is what matters.
• Avoid systemic insecticides on any flowering plant. If a plant is blooming, anything you put in the soil ends up in the pollen.
• Spot-treat pest issues mechanically (hand removal, water spray, row cover) before reaching for chemistry.
• If a licensed pest control operator works on your property, ask in writing whether they are using neonicotinoids and whether they have screened the site for CESA-listed species.
• For bee colonies on the property: call a permitted relocator (free in Sacramento County via The Bee Conservatory), not an exterminator.

Habitat: What Property Owners Can Legally — and Helpfully — Do

CESA does not require Sacramento homeowners to actively create bumble bee habitat. It prohibits killing or harming the listed species. But active habitat support is the highest-leverage action a private property owner can take, because the listed bumble bees' decline is driven primarily by habitat loss, pesticide exposure, and pathogen spillover from commercial bumble bee operations — all of which residential gardens can address.

Plant Bumble Bee Forage That Bridges the Whole Season

Bumble bee colonies in Sacramento are active March through October. Listed species need continuous forage across that window; gaps of more than 10–14 days can starve a colony. The Xerces Society California pollinator plant list highlights manzanita, California lilac (Ceanothus), white sage, California buckwheat, blue elderberry, narrowleaf milkweed, common yarrow, gumplant, vinegarweed, and California fuchsia as a year-round bumble bee combination. Our guide to why bees matter for California's food supply goes deeper on the agricultural side; for backyard plant selection, ten native species selected for staggered bloom is more useful than 30 generic "pollinator" plants.

Protect Nest Sites You Probably Already Have

Bumble bees nest underground, typically in abandoned rodent burrows. Many also nest in dense thatch, leaf litter, hollow logs, and the wall voids of older homes. The most common reason a Sacramento bumble bee colony fails is not predation or pesticide — it is the homeowner mowing, tilling, or pulling the brush pile that hid the colony entrance. Practical actions: leave a corner of the yard unmown from March through October, retain leaf litter under shrubs, do not till untouched ground in spring, and pause any major landscape disturbance if you observe bumble bee activity in a specific spot.

Distinguish Native Bumble Bees from Honey Bees

Honey bees (Apis mellifera) are not protected under CESA — they are non-native, managed livestock. Native bumble bees are. The distinction matters because bee removal calls in Sacramento often involve honey bee swarms, which require different handling and zero CESA risk. Our honey bees vs. native bees guide covers the visual differences in detail; the short version is that bumble bees are larger, fuzzier, slower, and visit one flower at a time, while honey bees are smaller, less hairy, and forage in fast-moving groups.

What to Do If You See a Suspected Listed Bumble Bee

Sacramento residents who spot a bumble bee that might be one of the four listed species should treat the sighting as a small but real conservation event. The right response is documentation, not action.

• Photograph from above and from the side, focused on the abdomen color pattern and the face — these are the diagnostic features.
• Note the date, time, GPS location (a phone screenshot of the map satisfies this), and the plant the bee was visiting.
• Submit to Bumble Bee Watch — the platform CDFW and Xerces use for occurrence records. Your observation is reviewed by a regional expert and becomes part of the official dataset.
• Cross-post to iNaturalist if you use it; the two platforms now share data through a partnership that began in 2023.
• Do not collect, capture, handle, or trap the bee. Even a well-meaning capture-and-release is technically take of a CESA species without a scientific collecting permit.
• If the bee is in a residential conflict situation (in a wall, in a heavily-used pathway), contact The Bee Conservatory or a permitted relocator before any action.

Our Sacramento citizen science guide walks through Bumble Bee Watch and iNaturalist setup step by step, with screenshots and a Sacramento-specific photo checklist.

What This Means for Sacramento Real Estate, Construction, and Landscaping

The CESA listings do not stop at homeowners. Commercial pesticide applicators, landscape contractors, builders, and agricultural operators in Sacramento County now operate under the same legal framework. CDFW has issued formal guidance to industry: large-scale projects on undeveloped land within historic Crotch's bumble bee range may require a pre-construction survey, and pesticide applicators must screen sites for listed bee presence on flowering vegetation before treatment.

Defenders of Wildlife has tracked compliance closely since the 2022 ruling. As of 2025, CDFW had issued at least a small but growing set of incidental take permits for solar projects, road expansions, and agricultural conversions in the Central Valley — each requiring habitat mitigation, monitoring, and an avoidance plan. For a Sacramento homeowner, none of that paperwork applies. For a Sacramento contractor preparing to clear a 20-acre parcel of grassland on the edge of Elk Grove or Galt, all of it potentially does.

A Working Compliance Checklist for Sacramento Trades and Property Managers

• Before any major ground disturbance on undeveloped grassland or oak woodland in the Central Valley, request a pre-construction bumble bee survey from a CDFW-approved consulting biologist.
• Schedule major vegetation clearing outside the active colony season (avoid March through October) where feasible.
• Train pest control technicians on the four listed species' visual ID before residential and commercial spray jobs.
• Add a CESA-listed species clause to landscape and pest control contracts; document any bumble bee sightings in writing.
• If a listed species is encountered during a project, halt work in the immediate area and contact CDFW's Region 2 office at the Rancho Cordova field station.

What the Listing Has — and Has Not — Done So Far

The listing went into legal effect in late 2022. The first three years are too short to expect population recovery for animals as long-lived as bumble bee colonies (one season per generation). What has shifted: regulatory cover for CDFW pesticide review, formal standing for Xerces Society and Defenders of Wildlife in agricultural permit decisions, a measurable uptick in Bumble Bee Watch submissions from California (a 41% increase from 2022 to 2024 according to Xerces' annual reporting), and a small but real policy ripple — Oregon's wildlife agency cited the California ruling in 2024 when expanding its own invertebrate listing authority.

What has not shifted yet: actual occupancy data for any of the four species in their Sacramento Valley historic range. Bombus crotchii remains rare. Bombus occidentalis remains essentially absent from the region west of the Sierra. The listings buy these species a legal floor to land on; they do not by themselves grow more bumble bees. That work happens pollen grain by pollen grain, in backyards, schoolyards, urban parks, and the agricultural margins where the Sacramento Valley actually lives.

Frequently Asked Questions

Are bumble bees endangered in California?

Four California bumble bee species are protected as candidates for listing under the California Endangered Species Act as of September 2022: the western bumble bee, Crotch's bumble bee, Franklin's bumble bee, and the Suckley cuckoo bumble bee. Candidate species under CESA receive the same legal protections as fully listed species during the candidacy review. Three of the four — western, Crotch's, and Suckley cuckoo — have historic Sacramento Valley records. Other California bumble bees, including the common yellow-faced bumble bee, are not currently listed and remain unprotected.

What bumble bees are protected in California?

The four protected species are Bombus occidentalis (western), Bombus crotchii (Crotch's), Bombus franklini (Franklin's), and Bombus suckleyi (Suckley cuckoo). Sacramento-area residents are most likely to encounter Crotch's bumble bee, which still has current Central Valley records. Honey bees (Apis mellifera) are not protected under CESA — they are non-native managed livestock and fall under different regulatory frameworks.

Is it illegal to kill bumble bees in California?

It is illegal under California Fish & Game Code § 2080 to take, possess, purchase, or sell any of the four CESA-listed bumble bee species without an incidental take permit issued by CDFW. "Take" includes killing, capturing, harassing, or significantly modifying habitat. Killing a non-listed bumble bee species (such as the common yellow-faced bumble bee) is not a CESA violation, though it may run afoul of local pesticide application rules. The safest practice for any Sacramento property owner who encounters a bumble bee is non-lethal relocation or simply leaving the colony alone.

What does CESA listing mean for homeowners?

CESA listing means a homeowner cannot legally kill, capture, or harm any of the four protected bumble bee species on their property. Practically, the most common compliance issues are pesticide use (especially neonicotinoids on flowering plants) and hiring exterminators to destroy bee nests without first confirming the species. Homeowners are not required to actively create habitat or to conduct surveys, but they are required not to take a listed species. The simplest path to compliance is to leave bumble bees alone, avoid systemic pesticides, and call a permitted bee relocator (free in Sacramento County via The Bee Conservatory) for any nest conflicts.

How do I report a Crotch's bumble bee sighting in Sacramento?

Photograph the bee from above and from the side, capturing the face and abdominal pattern. Submit the photos with date, time, and location to Bumble Bee Watch (bumblebeewatch.org), which is reviewed by Xerces Society and University of Ottawa specialists and shared with CDFW. You can also report directly through The Bee Conservatory's reporting page if you would like a local biologist to verify the sighting first. Do not collect or handle the bee — even temporary capture without a permit is technically take of a CESA species.

Can I get an incidental take permit for bumble bees?

Yes, but the process is substantial. Incidental take permits under Fish & Game Code § 2081 require a written application to CDFW, a mitigation plan that fully offsets the impact, ongoing monitoring, and public notice. They are designed for large infrastructure, agricultural, or development projects — not for residential homeowners. For a backyard bee conflict, the right answer is non-lethal relocation, not a permit application.

Sacramento's Role in California Bumble Bee Recovery

Sacramento County sits inside the historic range of three of the four CESA-listed bumble bees and at the edge of remaining suitable habitat for the most-likely-to-be-encountered species, Crotch's bumble bee. That makes the county a meaningful piece of the recovery puzzle. The Sacramento Valley was once one of the richest bumble bee landscapes in North America — early-20th-century survey records from Sacramento, Yolo, and Solano counties document species diversity that no contemporary survey has matched.

Recovery, if it happens, runs through residential yards, school gardens, agricultural margins, and protected lands. The Bee Conservatory works on every part of that chain: free bee relocation in Sacramento County, native plant installations at schools and on private property, citizen science training, and habitat connectivity work along the American and Sacramento River corridors. None of that work was created by the CESA listing — but the listing changed the legal context in which it happens. It is now genuinely possible for a Sacramento homeowner to ask, "Am I doing right by the bumble bees on my property?" and to mean it as a question with a legal answer, not just an ethical one.

California's endangered bumble bees are not a distant problem. Three of the four CESA-listed species belong to the Sacramento Valley as much as oak woodlands and tule marshes do. The 2022 listing is a legal floor — the actual recovery happens slowly, and on the ground, in the places where ordinary property owners decide what to plant, what to spray, what to leave alone, and what to call us about. Every one of those decisions matters. The bumble bees do the rest.