Bee Colony Strength Requirements: A Guide for Growers

Growers who specify minimum hive strength in their contracts see 25% better crop set than those who do not. The difference isn't because the same beekeeper delivers stronger colonies when a minimum is written. It's because a written minimum attracts beekeepers who can meet it and deters those who can't.

If you're an almond or berry grower buying pollination services, this guide covers what strength standards mean, how to specify them in your contract, and how to verify compliance without becoming a beekeeper yourself.

TL;DR

• The California Almond Board's research supports 6 frames of bees as the minimum effective colony strength for almond pollination.
• Many growers now specify 8 frames for premium contracts, with rates at $200-215/hive versus $185-195 for 6-frame minimums.
• Hive strength assessment should be documented by yard, date, and assessor to create a defensible record for contract compliance.
• A colony assessed at the required strength in January can fall below minimum by February delivery if varroa loads are high or weather stress is severe.
• Third-party inspection at delivery is the cleanest resolution for strength disputes and protects operators as well as growers.

What Is "Hive Strength"?

Hive strength measures the productive capacity of a bee colony. In a commercial pollination context, it's expressed as "frames of bees": the number of standard Langstroth frames in the colony with both faces covered by worker bees.

A frame of bees is approximately 2,500-3,500 workers. A 6-frame colony has roughly 15,000-21,000 bees actively covering frames, plus additional bees in cells, on combs, and on the bottom board.

Why does strength matter for your crop?

Higher population = more foragers. Forager bees are the ones visiting your flowers. More foragers means more flower visits per hour per acre, which means more cross-pollination, which means better fruit or nut set.

Strong colonies maintain population through the placement period. A 4-frame colony placed at bloom may decline further under the stress of relocation. A 7-frame colony can lose some population to transport stress and still have adequate foragers for the full bloom window.

Brood presence predicts future population. A colony with strong brood is raising its next forager generation during bloom. It will be as strong or stronger at pickup as at delivery.

Understanding Frames of Bees

A frame of bees is a tangible, countable metric that any beekeeper can measure and any grower can verify with a basic orientation.

To see frames of bees: when a hive is opened, count the frames where bees visibly cover both faces. A frame with bees wall-to-wall on both sides = 1 frame. A frame with bees on one side only = 0.5 frame.

This is what your beekeeper counts when they assess your delivery. And it's what a third-party inspector counts when verifying compliance. The metric is the same regardless of who's counting.

Common minimum standards by crop:

• Almonds: 6 frames of bees (industry standard minimum)
• Cherries: 6 frames of bees
• Apples: 5-6 frames of bees
• Blueberries: 5-6 frames of bees
• Watermelon: 4-5 frames of bees

These are minimums, not targets. Strong operations deliver 7-8 frame colonies as a standard, which is why specifying a minimum of 6 doesn't limit you to 6-frame delivery.

How to Write a Strength Minimum Into Your Contract

Your pollination contract should include specific, measurable strength language. Here's a model clause:

"Beekeeper shall deliver colonies averaging a minimum of 6 frames of bees per colony, as assessed at time of delivery. Individual colonies below 5 frames of bees shall not count toward the contracted colony total and shall be replaced within 48 hours of identification or credited at $[amount] per colony."

Key elements:

• "At time of delivery" establishes when measurement occurs
• "Individual colonies below X frames" defines the threshold for exclusion
• "Replaced within 48 hours or credited" provides a remedy that doesn't require a lawsuit

You can adjust the threshold and remedy for your specific crop and relationship. The language above is a starting point, not a fixed form.

For contract templates with strength clauses already included, the PollenOps grower-facing pollination tools provide standardized contracts that cover these terms.

Verifying Compliance Through PollenOps

When your beekeeper uses PollenOps, compliance verification is straightforward:

Before delivery: Your beekeeper runs a pre-move assessment scoring every colony on the PollenOps 1-10 quality scale. You can access this data in your grower portal before the truck leaves. You see the aggregate score, the count of colonies at or above your minimum, and the distribution of scores.

At delivery: The delivery timestamp, GPS coordinates, and hive count are recorded automatically.

After delivery: Your portal access log shows you viewed the delivery data, creating an implicit acknowledgment of receipt.

Without PollenOps, your verification options are manual inspection at delivery or hiring a third-party inspector. Both are valid but require more work and coordination.

What to Do If Strength Is Below Minimum

Your contract's remedies clause covers this, but the practical process:

At delivery:

1. Do a sample inspection of 10-15% of delivered hives.
2. If you find colonies that clearly don't meet minimum strength, document with photos and note the hive count.
3. Notify your beekeeper in writing (text or email) that day.
4. Reference your contract's replacement or credit clause.

After delivery:

Disputes about strength are much harder to resolve after the fact without documentation. A photo taken at delivery of an obviously light colony is your evidence. A complaint made two weeks after delivery, with no delivery-day documentation, is difficult to enforce.

The strength verification documentation from PollenOps's hive strength requirements portal provides pre-delivery records that eliminate most disputes before they start.

Frequently Asked Questions

How do I specify hive strength requirements in my pollination contract?

Write a specific frame-count minimum into the contract with a clear measurement standard and a remedy clause. Example: "Beekeeper shall deliver colonies averaging a minimum of 6 frames of bees per colony as assessed at delivery. Colonies below 5 frames do not count toward the contracted total and shall be replaced within 48 hours or credited at [rate] per colony." Specify who performs the assessment (beekeeper, third-party inspector, or grower) and what documentation will be provided. Without these specifics in writing, "strong colonies" is not enforceable.

What is a frame of bees and how do I count frames?

A frame of bees refers to one standard Langstroth frame with worker bees covering both faces. When the hive is opened, you count how many frames have bees visibly covering both sides. A fully covered frame (both sides) counts as 1 frame. A frame with coverage on only one face counts as 0.5. A frame with sparse coverage counts proportionally. Most commercial colonies going into contract placement have 4-9 frames. The industry standard for almond pollination is 6 frames minimum. You can count frames yourself at delivery, or your beekeeper can show you the assessment process during any yard visit if you want to understand it firsthand.

How do I use the PollenOps portal to verify that my beekeeper's hives meet my strength standards?

If your beekeeper uses PollenOps and has set up a grower portal for your contract, log into your portal before your delivery date. Navigate to your contract and view the pre-move assessment records. You'll see the average quality score for the delivery, the count of colonies at or above your specified minimum, and the score distribution. A delivery of 100 colonies with 92 at or above your minimum is clearly documented; a delivery where only 70 colonies meet minimum is equally clear. If you have concerns before delivery, you can contact your beekeeper referencing the specific assessment data in the portal.

How is hive strength measured for commercial contract compliance?

Hive strength is typically measured by counting frames of bees: the number of frames in the brood box that are covered (both faces) by worker bees. A frame covered on both faces counts as one frame of bees. Some assessors use a modified approach counting only the top face of each frame. The contract should specify the measurement method, since a hive assessed at 6 frames by one method might be 5 frames by another. Third-party inspection using a consistent, documented method is the cleanest standard for compliance.

What causes hives to fall below strength requirements between assessment and delivery?

Several factors can reduce colony strength between pre-season assessment and delivery: high varroa loads with insufficient treatment response, poor winter weather in northern states during transport south, queen failure or queen loss in the weeks before delivery, and nutritional stress from limited forage. Commercial operators typically re-assess colonies 1-2 weeks before departure to confirm strength has been maintained, replacing any colonies that have declined with stronger hives from their reserve inventory.

Can strength requirements be met with a recently split colony?

No. A recently split colony (within 4-6 weeks) will not have a full brood cycle's worth of adult workers emerging to maintain population. A split colony may appear to have adequate frames at the time of split but will decline in population over the following weeks as older workers die without emerging brood to replace them. Colonies going to almond pollination should have had their most recent split at least 8-10 weeks before delivery to allow full population recovery.

Sources

• USDA Agricultural Research Service
• Bee Informed Partnership
• American Beekeeping Federation (ABF)
• Almond Board of California
• Project Apis m.

Get Started with PollenOps

Hive strength documentation is the foundation of contract compliance and dispute prevention. PollenOps structures strength assessment records, delivery confirmations, and inspection data so you have the evidence you need when questions arise about contract performance.