Three Windows Price Your December. Two Have Closed. The Third Opened August 30.

All three national carriers have now published their 2026 peak schedules. FedEx went first on July 22. USPS filed on August 25. UPS published on August 26. Thirty-five days from first to last, and all three seasons close within a day of each other in mid-January.

Most of the coverage has treated these as three announcements about prices. Read them side by side and the prices are the least interesting part. What decides your December is not the tables. It is three measurement windows, and two of them closed before you had the tables to read.

They do not all apply to all three carriers, and which one applies to you changes what you can still do. Window one is UPS. Window two is FedEx and UPS. Window three is UPS alone. USPS does not measure you at all.

Window one: qualification. This one is UPS, and it reaches back to last October

UPS moves you onto its Higher Volume Shipper tables when you are billed for more than 20,000 combined residential and Ground Saver packages in a single week. The threshold reads “in any week after October 2025,” and once met the surcharges apply until further notice.

Read that sequence again. It is not a 2026 test. One outsized week last November puts you on this schedule now, and nothing you ship this year takes you off it.

That single provision explains something a lot of shippers are about to discover the hard way. If you moved volume away from UPS during 2026 specifically to reduce peak exposure, you did not un-qualify. You reduced the number of packages riding the schedule. You did not get off the schedule.

Window two: the baseline. This one is FedEx and UPS, and it was June

FedEx prices its Demand Residential Delivery Charge off your average weekly volume from June 1 to June 28. UPS sets its baseline from May 31 to June 27.

Both windows closed before either schedule existed. FedEx published 24 days after its baseline period ended; UPS published 60 days after. So the number that decides which row you land on was recorded before you could read the table. Whatever the reason for that sequence, the effect is the same: the largest single input to your peak cost was set in a month when nothing about peak was on the calendar.

Every figure comes from the carriers’ own published schedules. Both also publish separate air and express ladders that run higher. This compares structure, thresholds and ceilings; how each charge applies within a qualifying week is written differently in each schedule and should be read against your own volume rather than assumed to match.

Which narrows what moving volume actually does

The common instinct is to shift residential volume between the two when one schedule looks worse. Look at what that changes. Both qualify you at roughly the same weekly count, both begin charging at the same percentage of a June you have already shipped, and both ground ladders top out at the same number. Moving packages from one to the other changes which carrier bills you. It does not move you to a different kind of schedule.

Stack window one on top and the ceiling drops further. On the UPS side you may already be qualified from a week last November, so volume you moved in 2026 reduced your count without touching your status.

Diversification reduces the number of packages exposed. It does not change the mechanism, and it cannot reach back to windows already closed.

USPS measured nothing

USPS did not put you on a clock at all. Its peak pricing is a fixed amount per package by weight and zone, applied from the first parcel, effective October 4 through January 17.

That carries one large advantage and one large cost. You can calculate it exactly, today, from your own shipment profile. No baseline, no percentage, no tier to cross. The cost is the size of it: commercial prices land around 40% above 2025, and that increase sits on three earlier increases on the same parcel this year.

So the honest comparison is not which carrier is cheaper. One of your three lets you know your exposure in advance and charges heavily across the whole season. Two charge less at the bottom and hold the number open until the week happens.

Window three: the only one still running, and it is UPS alone

This is a UPS provision. It opened August 30, it closes September 26, and every week between those dates is being counted right now.

If your average weekly UPS volume from August 30 through September 26 comes in below 80% of your May 31 to June 27 average, September replaces June as your UPS baseline.

If you ship FedEx, this does not reach you. FedEx published one baseline period and no mechanism to reopen it, so a FedEx shipper’s number was fixed when June closed. Do not read the next four weeks as a lever on both carriers. It is a lever on one.

Note which direction that runs. A lower baseline does not lower your cost. It makes every peak week a higher multiple of a smaller number, which moves you up the ladder rather than down. A shipper whose September is quiet, including one whose September is quiet because volume moved elsewhere this year, can walk into November on a worse tier than a shipper who did nothing.

Worth modeling in the next four weeks. Not a reason to push volume around in September to influence a baseline. That is not a strategy, and not one I would put in front of a carrier.

The mechanic is not universal

Everything above is a property of how the national carriers price peak. It is not a property of moving a parcel.

A volume-against-baseline surcharge requires a carrier that measures you against your own history. Carriers that price peak as a flat amount, or that do not levy one, create no window to miss. USPS is that case inside the big three. Much of the regional and alternative market prices peak differently or not at all, and that is a structural difference rather than a discount.

Two caveats, and the second matters more. You cannot onboard, integrate, test and ramp a carrier between now and October 4 and expect a cheaper December, and anyone promising that in the next three weeks is selling. And it does not work backward: volume that stays on UPS stays on a schedule that qualified you last October.

The part that matters for next year

If two of your three carriers price your peak off June, then June is when your peak is priced. Almost nobody treats it that way. Peak planning starts in September, by which point two of the three windows are shut and the only levers left are operational: package characteristics, service mix, the residential and commercial split, and how much of December you can move off the weeks that price highest.

The shippers in better shape in 2027 will be the ones who go into next June knowing that the promotion, the channel shift or the carrier pilot they run that month carries a December consequence that is invisible at the moment they decide it, and who have already answered the prior question: how much of December do you want sitting on a mechanic that prices you against yourself?

That is a visibility problem, not a volume problem. The answer is not to inflate June. It is to stop making June decisions with the peak cost hidden.

Takeaway: Three windows price your December. Qualification reaches back to last October, the baseline was June, and only the August 30 to September 26 window is still open. Two of the three were shut before the schedules were published.

When you planned for peak this year, did June come into it?