USPS revised its service standards in two phases in 2025: the first took effect April 1, 2025 and the second July 1, 2025. Together they shifted most long-distance First-Class Mail from air to ground transportation and tied the standard more closely to how far a piece is from the regional processing plant. The headline range for First-Class did not change, it is still 1 to 5 business days, but the distribution inside that range did, and those are the standards in force in 2026.
What actually moved
Local and regional mail is largely unaffected and still typically lands in 1 to 3 business days. The change shows up on longer hauls: mail traveling to the farther zones now runs 4 to 5 business days where some of it previously moved faster on air transportation.
That distinction matters because most campaign planning uses the headline range. If your list is regional, your planning assumptions still hold. If your list spans the country, the tail of your in-home window is now later than it was.
What it changes about planning
- Work backward from the in-home date, not forward from the drop date, and use the far end of the range for national lists.
- Treat the range as a window, not a date. Service standards are averages, not guarantees, and USPS does not commit to them the way it does for Priority Mail Express.
- If a date is genuinely fixed, an election deadline or an event, either build in more slack or move the piece to a class with a guarantee.
- Entering the mail deeper into the network through drop shipment tightens the window, because the piece skips part of the transportation that got slower.
The other classes
For reference, the current standards are First-Class Mail at 1 to 5 business days, USPS Marketing Mail at roughly 3 to 10, Priority Mail at 1 to 3, Priority Mail Express at 1 to 2 with a money-back guarantee, USPS Ground Advantage at 2 to 5, and Media Mail at 2 to 8.
Marketing Mail deserves a specific caution here. It is processed around faster classes, so its range is both wider and less predictable. It is the wrong class for anything genuinely date-critical, regardless of what the standard says.
What we do about it
Our In-Home Date Estimator prices the window by class and entry point, so you can see the effect of the change on a specific job rather than reasoning from the headline number. For a national list where the date matters, we will usually model a drop-ship plan alongside origin entry and compare the two.