For shippers & reefer brokers
Why this library exists
Two public USDA handbooks already encode most of what a produce desk needs to know about cold chain: Agriculture Handbook 66 (AH-66, 2016) on commercial storage, and AMS Handbook 669 on protecting perishable foods during truck transport. Together they exceed 890 pages. They are excellent — and almost unusable as daily tools.
ProspectSentinel / Sentinel Labs built interactive tools from those sources (commodity matrices, co-load checks, precool math, claim support). This Cold Chain Field Library is the narrative layer: modernized white papers that teach the decision system and link into the tools at the moment of need.
Audience: produce and cold-chain shippers (QC, dock, logistics) and reefer brokers who quote, cover, and defend loads. Not a substitute for your receiver’s PO specs — a shared language for why those specs exist.
The operating system in one screen
- Temperature dominates shelf life. Respiration and many deterioration processes roughly double for every 10 °C rise (AH-66 framing). Abuse is additive across dwell, transit, and unload (HB 669).
- Cold is not universally safe. Chilling injury damages many tropical/subtropical crops at temperatures still above freezing.
- Ethylene separates loads. High producers cannot casually ride with greens, cole crops, and many flowers.
- Transit ≠ storage. Handbook 669 often sets practical transit bands and ice rules that differ from long-term storage optima in AH-66.
- A reefer maintains; it does not precool at capacity. Field heat is a dock problem first.
- Five factors for mixed loads: temperature, RH, ethylene, odor pairing, and modified-atmosphere needs — formalized as USDA Groups 1–8.
USDA physics vs federal rules (eCFR)
This library teaches commodity and reefer physics from public USDA handbooks. Selected federal regulations on eCFR.gov set a separate legal floor for produce trade practice and freight claims. Use both — they answer different questions.
| Question | Start here | Public source |
|---|---|---|
| What temperature / mix / precool does the crop need? | This Field Library + tools | USDA AH-66 · HB 669 |
| What does PACA regulate for produce dealers? | PACA Good Arrival Calculator | 7 CFR Part 46 · § 46.44 |
| How are interstate motor carrier loss/damage claims investigated? | Claim package checklist · Deadline calculator | 49 CFR Part 370 |
Series map
| # | White paper | Job to be done |
|---|---|---|
| 01 | The Reefer Is Not a Precooler | Stop loading field heat |
| 02 | Colder Is Not Safer | Set floors, not “as cold as possible” |
| 03 | Ethylene: The Invisible Load Killer | Separate producers & sensitives |
| 04 | USDA Groups 1–8 | Official co-load playbook |
| 05 | Airflow & Load Patterns | Make setpoints real in the box |
| 06 | Commodity Setpoint Desk Guide | Transit vs storage temps |
| 07 | Protein, Dairy & Eggs | Beyond produce odor & temp rules |
| 08 | CA, MAP & Gas | When atmosphere extends life |
| 09 | From Temperature Log to Claim | Evidence + PACA intersection |
| 10 | Seasonal Produce Desk | Peaks, capacity, rates + physics |
How shippers and brokers should use this
Shipper dock / QC
- Confirm pulp temp vs transit band before release (Produce Shipper Transit Guide, Reefer Precool Time Estimator).
- Run mix check when more than one commodity shares air (Cold Chain Index, Produce Shipper Transit Guide Mix tab).
- Photograph product, pulp probes, and reefer setpoint/return air at seal.
- Treat top-ice and SO₂/grape fumigation rules as hard constraints, not preferences.
Broker / coverage desk
- Write setpoints and “no mix with…” on the rate con in commodity language, not vibes.
- Flag multi-temp when groups conflict; price the equipment you actually need.
- When a claim appears, reconstruct the timeline before arguing the photo (Perishable Claim Analyzer, PACA Good Arrival Calculator).
- Use seasonal rate context without forgetting physics (Produce Truck Rate Explorer).
PDF download · optional updates
Save this guide as a PDF
Download immediately—no account required. Optionally leave a work email for occasional cold-chain field notes from ProspectSentinel. Built for produce shippers, receivers, and reefer operations teams.
FAQ
Is this official USDA guidance?
No. These are educational modernizations of public USDA handbooks (AH-66 and HB 669) by ProspectSentinel / Sentinel Labs. Always consult the primary sources and your contracts.
Can I share these with customers?
Yes — that is the point. Share the HTML or PDF. Do not present them as legal or claims determinations.
Where are the interactive tools?
Sources & interactive tools
- USDA AH-66 — The Commercial Storage of Fruits, Vegetables, and Florist and Nursery Stocks (2016)
- USDA AMS HB 669 — Protecting Perishable Foods During Transport by Truck
- Federal rules (eCFR): 7 CFR Part 46 — PACA regulations · 49 CFR Part 370 — Principles and practices for the investigation and voluntary disposition of loss and damage claims
- Cold Chain Index — 200+ commodity storage/transit matrix + co-load checker
- Produce Shipper Transit Guide — dock setpoints, mix load, checklist
- Reefer Precool Time Estimator — half-cooling-time style estimator
- Perishable Claim Analyzer · PACA Good Arrival Calculator · Produce Truck Rate Explorer
- Freight claim package checklist · Claim / Carmack deadline calculator
Important notice
This publication modernizes and explains public USDA guidance and, where noted, points to public federal regulations on eCFR.gov for educational use by shippers, brokers, carriers, and operators. It is not an official USDA or DOT document, and it is not legal, insurance, PACA advocacy, food-safety certification, or professional claims advice. Always verify current commodity specifications, contracts, and the current eCFR text with the controlling authority and your counsel.
Primary sources: USDA-ARS Agriculture Handbook 66 (2016); USDA-AMS Handbook 669, Protecting Perishable Foods During Transport by Truck (1995, reprinted 2008), including Load Compatibility Groups from USDA Marketing Research Report 1070 (Lipton & Harvey, 1977). Selected federal regulation entry points: 7 CFR Part 46 (PACA); 49 CFR Part 370 (freight claims).
Full series
- 01 The Reefer Is Not a Precooler
- 02 Colder Is Not Safer
- 03 Ethylene: The Invisible Load Killer
- 04 USDA Groups 1–8: The Mixed-Load Playbook
- 05 Airflow, Load Patterns & Multi-Temp Zones
- 06 Commodity Setpoint Desk Guide
- 07 Protein, Dairy & Eggs on the Same Trailer
- 08 CA, MAP & When Gas Matters
- 09 From Temperature Log to Claim
- 10 Seasonal Produce Desk
Share with your team
Free to read, print, and forward. No account required. Bookmark the interactive tools or download the PDF for dock and desk use. Published by ProspectSentinel as an educational modernization of public USDA handbooks.
Optional email updates are available in the form above. Content remains free either way.