When is the last frost in Spokane, WA?

The average (50% probability) last spring frost in Spokane is April 26, based on NOAA 1991–2020 normals. A 1-in-10 risk remains until May 10.

When is the first frost in Spokane?

The average first fall frost in Spokane is October 12, with a growing season of about 168 days.

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Spokane, Washington frost dates

Average last spring frost: April 26. Average first fall frost: October 12. That gives a growing season of about 168 days. For frost-tender plants, a safer planting date is May 10, after which a freeze happens in only 1 year in 10.

Last frost (50%)

Apr 26

1-in-10 risk after May 10

First frost (50%)

Oct 12

1-in-10 risk before Sep 29

Growing season

168 days

median frost-free days

Hard freeze (28°F)

Apr 6

median last 28°F in spring

Frost risk by date

Chance of frost	Spring: frost after	Fall: frost before
90%	April 9	October 28
70%	April 20	October 18
50%	April 26	October 12
30%	May 2	October 6
10%	May 10	September 29

Read the spring column like this: there is a 10% chance of a 32°F freeze after May 10. These are NOAA probabilities for the Spokane International Airport weather station (USW00024157, elevation 717 m), 1991–2020.

Spokane vegetable planting calendar

Dates count from the 50% last-frost date (April 26). For tomatoes, peppers and other frost-tender crops, waiting until the 10% date (May 10) is the cautious choice.

Crop	Start seeds indoors	Plant out
Beans	Apr 5	May 3 (usually sown directly in the garden)
Broccoli	Feb 15	Mar 29
Brussels sprouts	Feb 15	Mar 29
Cabbage	Feb 8	Mar 22
Cauliflower	Mar 1	Apr 12
Sweet corn	Mar 29	Apr 26 (usually sown directly in the garden)
Cucumbers	Apr 12	May 3
Kale	Feb 8	Mar 22
Leeks	Jan 11	Mar 22
Lettuce	Mar 8	Apr 12
Melons	Apr 19	May 10
Onions	Jan 4	Mar 15 (from seed; sets and transplants go out at the same time)
Peas	Mar 1	Mar 29 (usually sown directly in the garden)
Peppers	Mar 15	May 10
Squash	Apr 19	May 10
Tomatoes	Mar 1	Apr 26

Offsets from Oregon State University Extension's seed-starting table. "Plant out" means transplant, or sow directly for crops usually grown from seed.

Fall frost and season extension

The first fall freeze usually arrives around October 12. There's a 1-in-10 chance it comes before September 29. Harvest tender crops such as basil, tomatoes, peppers and squash before then, or cover them on cold nights. Cool-season crops like kale, cabbage and Brussels sprouts handle light frost, and often taste sweeter after it. A hard freeze (28°F) typically comes around October 23.

Nearby cities

City	Last frost (50%)	First frost (50%)	Distance
Yakima, WA	May 8	Oct 4	~254 km
Missoula, MT	May 16	Sep 26	~269 km
Seattle, WA	Mar 2	Nov 23	~359 km
Portland, OR	Mar 13	Nov 19	~441 km
Boise, ID	Apr 24	Oct 21	~460 km
Eugene, OR	Apr 11	Oct 23	~576 km

More: all Washington frost dates