Where these estimates come from
USPS 2026 send-by dates were verified directly on usps.com on 2026-09-28. FedEx and UPS had not published 2026 dates as of that check; their values are projections from 2025 references recorded on 2026-08-02.
Published, projected, not guaranteed
Planning estimate only, not a delivery guarantee. Confirm route, acceptance time and service availability with the carrier.
USPS dates for 2026 are the carrier's own published recommendations, verified by opening the USPS holiday page on 2026-09-28. FedEx and UPS had not published 2026 dates as of that check: for those services the model counts shipping days between its stored 2025 reference send-by date and its recorded arrival target, then counts the same number back from the 2026 target. USPS targets December 25; the FedEx and UPS references target December 24. Sundays are excluded. Saturdays, peak capacity, local pickup times and each origin/destination pair are not fully modeled, so the estimate may be wrong in either direction.
Evidence and gaps
The 2025 references were collected from search-result extracts, not verified by opening the carrier pages; USPS 2026 dates were verified directly on usps.com. Known conflicting FedEx 2Day and UPS 2nd Day Air references are withheld. UPS Ground has no national date in the source data. DHL is unsupported. Amazon promises vary by item, address and checkout.
Non-2026 dates are unsupported. Minor-holiday projections are withheld until their holiday-specific transit arithmetic is validated. This edition supports Christmas 2026 estimates only. A known FedEx closure inside a projected transit window withholds the estimate.
Publication and calendars
There is no live feed, automatic verification or promised update interval. A Published recommendation requires primary-source verification recorded for that exact service and season. Calendar files are tentative all-day planning reminders based on the displayed model date, not appointments or delivery guarantees.