Frost Dates: First and last frost dates for Paisley, OR

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 21, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around July 5, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before June 25, 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° Apr 17 Apr 5 Mar 28 Mar 21 Mar 14 Mar 8 Mar 1 Feb 20 Feb 9
Last 20° May 4 Apr 26 Apr 20 Apr 15 Apr 10 Apr 5 Mar 31 Mar 24 Mar 16
Last 24° May 21 May 14 May 9 May 5 May 2 Apr 28 Apr 24 Apr 19 Apr 12
Last 28° Jun 7 May 31 May 26 May 22 May 18 May 13 May 9 May 4 Apr 27
Last 32° Jul 5 Jun 28 Jun 23 Jun 19 Jun 15 Jun 11 Jun 7 Jun 2 May 26
Last 36° Jul 21 Jul 15 Jul 11 Jul 8 Jul 5 Jul 2 Jun 29 Jun 25 Jun 19

ℹ️ How to read these charts for the fall

As summer ends in Paisley, OR, 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 26, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By September 8, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By September 20, 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 20 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 17 Oct 23 Oct 28 Nov 1 Nov 4 Nov 7 Nov 11 Nov 16 Nov 22
First 20° Oct 5 Oct 12 Oct 16 Oct 20 Oct 24 Oct 27 Oct 31 Nov 4 Nov 11
First 24° Sep 28 Oct 3 Oct 7 Oct 10 Oct 14 Oct 17 Oct 20 Oct 24 Oct 29
First 28° Sep 12 Sep 17 Sep 21 Sep 24 Sep 27 Sep 30 Oct 3 Oct 6 Oct 11
First 32° Aug 19 Aug 26 Aug 30 Sep 4 Sep 8 Sep 11 Sep 16 Sep 20 Sep 27
First 36° Aug 14 Aug 19 Aug 23 Aug 27 Aug 30 Sep 2 Sep 5 Sep 9 Sep 15

📍 Frost Dates for other nearby locations

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