When is the last frost in Uniontown, WA?

Frost is possible in any month at the nearest NOAA station (Moscow U Of I, ID), so there is no reliable average last frost date.

When is the first frost in Uniontown, WA?

Frost is possible in any month at the nearest NOAA station.

Are these frost dates a forecast?

No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.

Frost dates for 99179Uniontown, WA

Frost is possible in any month near Uniontown, based on NOAA 1991-2020 records for the Moscow U Of I, ID station.

Frost is possible in any month. Even summer nights can drop to freezing at this station, so protect tender plants whenever cold nights are forecast.

Frost risk by date

NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
Temperature	Last spring: 90% / 50% / 10% chance	First fall: 10% / 50% / 90% chance	Growing season (50%)	Years with at least one
Light frost (36°F)	—	—	41 days	100%
Frost / freeze (32°F)	—	—	85 days	100%
Hard freeze (28°F)	Apr 27 · May 14 · Jun 8	Sep 6 · Sep 23 · Oct 9	133 days	100%

Where these dates come from

ZIP code 99179 is matched to the NOAA station Moscow U Of I, ID, 24.7 km away, at 2,660 ft elevation (22 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Moscow U Of I, ID (used)	2,660 ft	—	—
Lewiston Nez Perce Co Ap, ID	1,436 ft	Apr 6	Oct 26
Pullman Moscow Rgnl Ap, WA	2,551 ft	Apr 29	Oct 2
Pullman 2 Nw, WA	2,515 ft	May 6	Sep 29

Frost dates near Uniontown

Colton, WA 99113 · last Apr 29, first Oct 2
Genesee, ID 83832 · last —, first —
Clarkston, WA 99403 · last Apr 6, first Oct 26
Pullman, WA 99164 · last May 6, first Sep 29
Moscow, ID 83844 · last —, first —
Lewiston, ID 83501 · last Apr 6, first Oct 26
Lapwai, ID 83540 · last Apr 6, first Oct 26
Juliaetta, ID 83535 · last Apr 6, first Oct 26

Frequently asked questions

When is the last frost in Uniontown, WA?: Frost is possible in any month at the nearest NOAA station (Moscow U Of I, ID), so there is no reliable average last frost date.
When is the first frost in Uniontown, WA?: Frost is possible in any month at the nearest NOAA station.
Are these frost dates a forecast?: No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.