Almond Bloom Timing by County: California Commercial Beekeeper Guide

Operators who understand county-level almond bloom timing can place 20-30% more hives per truck per season by sequencing multiple county contracts. Southern valley counties bloom 7-10 days earlier than northern counties, which is exactly the window you need to move colonies from your first delivery to your second.

This guide covers California almond bloom timing by county, the factors that create timing variation, and how to build a sequenced county-level contract strategy.

TL;DR

California's primary commercial beekeeping role is shaped by its crop mix, climate, and position on the national pollination circuit.
Pollination rates in California range $65-220/hive depending on crop depending on crop and colony strength requirements.
Out-of-state operators entering California for pollination contracts must register with the state agricultural authority and obtain a Certificate of Health.
California functions as either a primary pollination destination, a seasonal honey production location, or a transitional stop depending on the circuit.
Tracking permit status, registration documents, and yard records for California operations requires organized record-keeping before the season opens.

County-by-County Bloom Timing

California almond bloom runs from the southern end of the San Joaquin Valley north to the Sacramento Valley. Peak bloom timing by major county (based on historical averages for Nonpareil variety):

Earliest Bloom (Late January to Early February):

Kern County: January 28 - February 7 average
Tulare County: January 30 - February 9 average

Standard Bloom (February 5-18):

Kings County: February 3 - February 12
Fresno County: February 5 - February 14
Madera County: February 7 - February 16
Merced County: February 8 - February 18

Mid-Season Bloom (February 10-22):

Stanislaus County: February 10 - February 20
San Joaquin County: February 12 - February 22
Contra Costa County: February 12 - February 22

Latest Bloom (February 15-28):

Sacramento County: February 15 - February 25
Sutter County: February 17 - February 27
Colusa County: February 17 - February 27
Glenn County: February 18 - February 28
Tehama County: February 20 - March 2

These ranges are approximate historical averages. In any given year, actual bloom timing can vary by 7-14 days earlier or later depending on January and February temperatures.

What Drives the North-South Timing Difference

The 3-4 week window between Kern County bloom and Tehama County bloom is driven by temperature accumulation (growing degree days) rather than calendar date.

Southern Valley counties (Kern, Tulare, Kings) have warmer winter temperatures that accumulate growing degree days faster. They reach the GDD threshold for bloom trigger earlier in the winter.

Northern Valley counties (Glenn, Tehama, Sacramento) are cooler and accumulate GDD more slowly. Their bloom occurs 2-3 weeks after the southern counties.

The same phenomenon creates the sequencing opportunity: if Kern County is at peak bloom on February 5, Stanislaus County may not reach peak until February 15-18. An operator who delivers to Kern in late January can exit those orchards and deliver to Stanislaus contracts starting February 12-14.

Sequencing Multiple County Contracts

A sequenced county strategy requires:

Confirmed contracts in at least two counties with non-overlapping peak bloom windows
Enough colony count to fill both contracts (the same colonies can't be in two places simultaneously)
Transport logistics between counties (plan for a 3-5 day movement window between delivery and recovery)

Example sequence:

Contract A: Kern County, 300 hives, delivery February 1, pickup February 28
Contract B: Stanislaus County, 300 hives, delivery February 14, pickup March 10

These two contracts require 600 colonies, not 300. You can't move the same colonies from Kern to Stanislaus mid-season. But if you have 600 hives available, you can fulfill both contracts in the same season by staging them appropriately.

Single-hive-pool sequencing:

If you have only 300 hives, you can still sequence across counties, but only if contract A's pickup precedes contract B's delivery. A Kern County contract with pickup February 25 and a Stanislaus contract with delivery March 1 can potentially be served by the same 300 hives with a tight movement window.

For almond pollination contract management and county-specific bloom timing alerts, PollenOps bloom alerts are calibrated by county so your Kern County alert fires before your Stanislaus alert.

When County Timing Goes Wrong

In years with unusual weather:

Early warm year: Southern counties may bloom 10-14 days earlier than historical average. An operator planning Kern County delivery for February 1 may find bloom at 40% when they arrive January 28.

Cold year: A persistent cold January delays the entire valley. Operators who planned for February 5-10 peak may find only 5-10% bloom on that date.

PollenOps county-level bloom alerts adjust in real time as temperature data comes in. A warm January in Kern County triggers an earlier alert; a cold January delays it. The alerts are calibrated to the actual season, not a fixed calendar.

Frequently Asked Questions

When does almond bloom start in Kern County?

Kern County almond bloom (Nonpareil variety) typically begins in late January, with peak bloom running from approximately January 28 through February 7 in average years. Kern County is the earliest-blooming almond county in California due to its southern location and warmer winter temperatures. In warm years (El Nino-influenced winters), Kern County bloom can begin in mid-January. In cool years, peak may be delayed to early February. PollenOps bloom alerts for Kern County fire based on growing degree day accumulation measured by weather stations in the county, providing more accurate timing than calendar-based estimates.

When does almond bloom in Stanislaus County vs Fresno County?

Fresno County almond bloom (Nonpareil) typically peaks from February 5 through February 14 in average years. Stanislaus County peaks approximately 5-6 days later, from February 10 through February 20. The difference reflects Stanislaus County's more northerly position in the San Joaquin Valley, which means slightly cooler average winter temperatures and slower growing degree day accumulation. In specific years, the gap can be as little as 3 days or as large as 10 days depending on how localized the temperature pattern is. PollenOps bloom alerts track each county independently based on local weather data.

How do you sequence almond contracts across multiple California counties?

Sequencing almond contracts across counties requires contracts with non-overlapping peak bloom windows and sufficient hive count for the total contracted volume. Map your target county bloom timing (Kern first, Fresno and Madera next, Stanislaus and San Joaquin after, northern counties last), identify the timing gap between each county's peak, and structure contracts so pickup from the early county precedes delivery to the late county by at least 3-5 days. Most operations sequence with separate colony pools for each county rather than moving the same hives between contracts. PollenOps contract timeline shows all your county contracts on one calendar view so you can see the sequencing at a glance and confirm no overlap conflicts.

What is the process for registering an out-of-state apiary in a new state?

Most states require out-of-state operators to register with the state department of agriculture apiary program before placing colonies. The process typically involves submitting a registration application (online or paper), paying a fee (usually $10-50 per location), and providing contact information for the operation. Some states also require the registration to be renewed annually. Contact the destination state's department of agriculture apiary program at least 60 days before your planned arrival to confirm current requirements.

What documentation do state apiary inspectors typically review?

State apiary inspectors review health certificates for out-of-state colonies, registration documentation, and colony inspection records during apiary visits. Inspectors check for signs of American foulbrood, European foulbrood, and other regulated pests and diseases. Operations with organized digital records that include treatment history and mite counts typically have faster, less complicated inspections than operations without documentation. Some state inspectors also verify that varroa mite loads are below state entry thresholds.

What triggers a state apiary inspection?

State apiary inspections can be triggered by routine inspection schedules (most states inspect a percentage of registered apiaries annually), neighbor or landowner complaints, disease reports from nearby operations, or inspection requirements tied to state entry permits. California, in particular, has the right to inspect incoming loads at port of entry for commercial beekeeping operations. Maintaining current registration and organized records makes required inspections faster and less disruptive.

Sources

USDA Agricultural Research Service
Bee Informed Partnership
American Beekeeping Federation (ABF)
California Department of Agriculture
Project Apis m.

Get Started with PollenOps

Commercial operations working in California face the same registration, permit, and documentation requirements as any state on the national circuit -- plus California's specific regulatory requirements. PollenOps tracks your California yard records, contract assignments, and permit documentation alongside your full operation, so entering a new state doesn't add a separate administrative burden. See how the platform fits operations working across multiple states.