Peak season shipping for frozen food runs from September through December, when holiday orders, winter weather and crowded distribution centers compete for the same refrigerated trucks. Suppliers who commit capacity in September keep holiday freight on schedule. Suppliers who book load by load in November pay that week's spot rate, and some of their loads get bumped.
This article is for frozen and refrigerated food brands shipping into retail and grocery distribution centers, including suppliers whose freight got bumped last holiday season and suppliers facing their first fourth quarter with a new retail order. If you're shipping a personal frozen package, a parcel carrier will be a better fit.
Quick Summary
Peak season for frozen freight runs from September through December, when holiday orders, winter weather and distribution center congestion tighten refrigerated truck capacity. Freight booked load by load on the spot market is the first to get re-priced or bumped. Frozen suppliers protect holiday shipments by committing capacity in September: carrier-owned trucks on core lanes, a scheduled consolidation pool for retail orders, and overflow capacity booked ahead.
What Happens to Reefer Capacity From September to December
Refrigerated truck capacity tightens from September through December because more frozen and refrigerated freight needs to move, and the supply of reefer trucks and drivers can't grow fast enough to match it. A reefer is a trailer with its own refrigeration unit. Four things tighten that capacity:
- Holiday retail orders: Retailers stock up for Thanksgiving and the December holidays, so order volume climbs through the fall.
- Winter weather: Storms in northern states and mountain passes slow trucks and can hold equipment in place for days.
- Distribution center congestion: Retail distribution centers (DCs) receive more freight before major holidays, so appointment slots fill faster.
- Holiday schedule changes: Walmart moves delivery windows around holiday weeks, covered in the LTA section below.
When a region's trucks are committed, a new load pays that week's market price. A late truck also leaves frozen product waiting on a dock. At Coldstream, our asset-based fleet stays on standby through holiday capacity crunches so our customers' freight keeps moving.
Planning Your Q4 Freight Now?
Coldstream runs frozen LTL, Walmart pools, refrigerated truckload and brokerage, so one team can plan every lane you ship.
Why Spot-Market Freight Gets Bumped First
Spot-market freight gets bumped first in a tight market because no carrier has committed a truck to it. The spot market is where loads get booked one at a time, at that week's rate. Committed freight runs on a schedule a carrier has already planned trucks and drivers around.
When capacity tightens, carriers cover committed freight first. A spot load competes with every other shipper looking for a truck that week, and it can be re-priced, delayed or dropped when someone offers more.
Brokerage works well when it's planned: a freight broker books capacity from other carriers before peak and manages each load through delivery. Our cold chain 3PL and freight brokerage services add capacity on top of our own trucks, managed by the same team.
How Holiday LTAs Affect Frozen Walmart Suppliers
Walmart uses lead time adjustments, or LTAs, to move delivery windows on purchase orders around high-volume holiday weeks, often after suppliers have already planned those orders.
Every Walmart purchase order (PO) carries a Must Arrive By Date, or MABD, when the freight is due at the DC. When an LTA moves that window, the ship date has to move too. A load shipped on the old schedule can miss its new window, and the miss counts against the supplier's OTIF (On-Time In-Full) score. Our guide to hitting Walmart's Must Arrive By Date covers the planning math, and Walmart publishes its requirements through Walmart Supplier Resources.
An earlier ship date is harder for frozen suppliers, because product has to be frozen and staged before pickup. For suppliers in our Walmart consolidation pools, Coldstream handles all LTA shifts directly with Walmart, so holiday weeks come and go without an interruption in service.
Six Things to Lock Down in September
Six decisions made in September protect frozen freight through December. Bring whatever you have: a peak-season planning call with our team works through all six.
- Committed capacity on core lanes: Weekly lanes should have a carrier that has already planned trucks for them. Our asset-based refrigerated trucking runs truckload lanes with our own trucks and reefers.
- A holiday volume forecast: A rough October through December forecast by lane lets your carrier hold trucks for that volume.
- A plan for LTA changes: Someone has to catch each LTA and move the ship date. In our Walmart pools, Coldstream handles that directly with Walmart.
- Freeze and staging time: A reefer holds temperature and can't bring warm product down to frozen. Build freeze time into the holiday production calendar, since a run that finishes late usually misses its pickup.
- Pool enrollment for Walmart freight: Joining a Coldstream Walmart pool takes your 9-digit Vendor ID. We handle communications with Walmart and start receiving your PO data within about two weeks, so a September start has POs flowing before holiday volume climbs. Freight reaches the pool by truckload, either on our trucks or with your own carrier.
- Overflow capacity booked ahead: Brokered capacity arranged in September and managed by your carrier's team holds up better than a truck found the week it's needed.
What Committed Capacity Looks Like in Practice
Committed capacity for frozen freight mixes carrier-owned trucks, scheduled consolidation and brokered overflow booked before peak. Each fits different freight:
| Capacity Type | Best Fit | How It's Booked |
|---|---|---|
| Asset-based truckload | Full trailers on lanes you ship regularly | Committed ahead of peak with a carrier that owns its trucks |
| Walmart consolidation pool | Partial loads into Walmart DCs every week | Fixed weekly departures with one DC appointment |
| Frozen LTL | Partial loads to other retail and grocery DCs | Shipment by shipment on the carrier's own network |
| Managed brokerage | Holiday spikes and lanes outside the network | Arranged before peak and managed by the same team |
| Spot market | One-off loads with flexible timing | Load by load at that week's rate; first to be bumped |
Most frozen suppliers use more than one. A brand with weekly Walmart orders and steady grocery lanes might use a pool for Walmart, truckload for core lanes and brokerage for a holiday promotion.
Coldstream is asset-based: we own and run the trucks and reefers on our customers' core lanes. Our Walmart consolidation program departs on its weekly schedule. We service all 48 contiguous states, and a supplier in any of them can join a pool with a 9-digit Vendor ID. Our service area and locations page lists our hubs and partners.
The Coldstream Experience
Our team at Coldstream runs 98%+ on-time delivery. Our asset-based fleet stays on standby through the holiday capacity crunch.
Our active Walmart pool hubs are in Worcester, MA and Holland, MI. Two more, in Kingman, AZ and Hattiesburg, MS, are in development. Suppliers can join a pool from any of the 48 contiguous states. Coldstream is an employee-owned, asset-based frozen and refrigerated specialist.
Coldstream does not handle hazardous materials.
Key Takeaways
- Peak season for frozen freight runs from September through December, when refrigerated truck capacity tightens.
- Freight booked load by load on the spot market is the first to be re-priced or bumped.
- Walmart lead time adjustments (LTAs) move delivery windows on planned purchase orders, and ship dates have to move with them.
- A reefer holds temperature and can't freeze warm product, so production schedules need freeze time before pickup.
- Committing capacity in September means owned trucks on core lanes, a scheduled pool for retail orders and brokered overflow booked ahead.
Frequently Asked Questions
When does peak shipping season start?
Peak shipping season for frozen and refrigerated freight usually starts in September and runs through December. Holiday retail orders build through the fall, and winter weather adds delays later in the season.
Why do freight rates go up in Q4?
Freight rates go up in Q4 because more freight competes for the same trucks and drivers. Spot-market rates rise first, so loads without a committed carrier pay that week's price. Frozen suppliers limit that exposure by committing capacity on core lanes before peak.
How do holiday LTA changes affect Walmart suppliers?
Holiday LTA changes move the delivery window on Walmart purchase orders, sometimes after the ship date is planned. A load shipped on the old date can miss the new window and hurt the supplier's OTIF score.
How far in advance should I book holiday freight?
Frozen suppliers should book holiday freight capacity in September, before holiday volume peaks. Suppliers joining a Coldstream Walmart pool should allow about two weeks for PO data to start flowing.
Final Thoughts
Frozen suppliers keep holiday freight on schedule by committing capacity in September. Our team at Coldstream runs our own trucks and reefers on core lanes, operates Walmart pools out of Worcester, MA and Holland, MI, and adds managed brokerage when holiday volume needs room. Suppliers in all 48 contiguous states can join a pool. Send us your lanes and fourth-quarter volume, and we'll map out how your freight moves through peak season.
