Frost Dates: First and last frost dates for Satus Pass, WA

ℹ️ How to read these charts for the spring

As spring unfolds, the risk of frost gradually decreases each day until your tender plants are finally safe. The probabilities shown in the chart help you make smart decisions about when to plant.

While frost typically forms at 32°F, tender plants can be damaged even when temperatures are slightly higher. Air temperatures are often measured several feet above the ground, but temperatures at plant level can be several degrees colder. Protected areas like porches help by blocking radiational cooling. Given these variables, we consider 36°F the "caution zone" for frost-sensitive plants.

Key dates for your spring planting:

  • By July 30, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around July 11, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before June 28, there's still an 80% risk of frost — too early for tomatoes and other tender plants unless you're prepared to protect them

If the 10-day forecast shows no temperatures below 40°F, you might safely plant earlier than the above dates suggest. Many gardeners watch for this weather window to get a head start on the growing season.

In the Spring
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
Last 16° Mar 28 Mar 13 Mar 2 Feb 21 Feb 12 Feb 3 Jan 25 Jan 14 Dec 29
Last 20° May 7 Apr 23 Apr 13 Apr 5 Mar 28 Mar 20 Mar 11 Mar 1 Feb 16
Last 24° Jun 2 May 22 May 15 May 8 May 2 Apr 26 Apr 19 Apr 11 Apr 1
Last 28° Jul 3 Jun 22 Jun 13 Jun 6 May 31 May 24 May 17 May 9 Apr 28
Last 32° Jul 21 Jul 12 Jul 5 Jun 30 Jun 24 Jun 19 Jun 13 Jun 7 May 28
Last 36° Jul 30 Jul 23 Jul 18 Jul 14 Jul 11 Jul 7 Jul 3 Jun 28 Jun 22

ℹ️ How to read these charts for the fall

As summer ends in Satus Pass, WA, nighttime temperatures begin to drop, and your risk of frost increases with each passing day. Knowing when to expect frost helps you harvest sensitive crops and extend your growing season with protection methods.

The chart below shows the probability of experiencing specific temperatures on various dates. Here's what this means for your garden:

1
Early warning: Around August 23, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By September 9, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By September 27, there's an 80% chance of seeing 32°F — most tender plants will be damaged without protection
4
Another perspective: You have only a 1 in 5 chance of making it past September 27 without a freezing night

These probabilities help you time your end-of-season harvests and know when to apply protective measures like row covers, cloches, or cold frames to extend your harvest.

In the Fall
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
First 16° Oct 31 Nov 9 Nov 16 Nov 21 Nov 26 Dec 2 Dec 7 Dec 14 Dec 23
First 20° Oct 15 Oct 24 Oct 30 Nov 5 Nov 10 Nov 15 Nov 20 Nov 27 Dec 6
First 24° Sep 20 Sep 30 Oct 7 Oct 12 Oct 18 Oct 23 Oct 29 Nov 5 Nov 15
First 28° Aug 31 Sep 8 Sep 14 Sep 19 Sep 24 Sep 29 Oct 4 Oct 10 Oct 18
First 32° Aug 14 Aug 23 Aug 29 Sep 4 Sep 9 Sep 15 Sep 20 Sep 27 Oct 6
First 36° Jul 30 Aug 8 Aug 14 Aug 20 Aug 25 Aug 30 Sep 5 Sep 11 Sep 21

📍 Frost Dates for other nearby locations

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Data is provided by the NOAA National Centers for Environmental Information.