Frost Dates: First and last frost dates for Redmond, 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 26, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around July 8, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before June 27, 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 19 Apr 7 Mar 30 Mar 23 Mar 16 Mar 9 Mar 2 Feb 22 Feb 10
Last 20° May 10 May 2 Apr 26 Apr 20 Apr 16 Apr 11 Apr 5 Mar 30 Mar 22
Last 24° May 24 May 17 May 12 May 8 May 4 Apr 30 Apr 25 Apr 20 Apr 14
Last 28° Jun 20 Jun 13 Jun 8 Jun 4 May 30 May 26 May 22 May 17 May 10
Last 32° Jul 7 Jun 30 Jun 26 Jun 22 Jun 19 Jun 15 Jun 11 Jun 7 Jun 1
Last 36° Jul 26 Jul 20 Jul 15 Jul 12 Jul 8 Jul 5 Jul 1 Jun 27 Jun 21

ℹ️ How to read these charts for the fall

As summer ends in Redmond, 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 30, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By September 11, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By September 22, 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 22 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 18 Oct 27 Nov 2 Nov 8 Nov 13 Nov 18 Nov 24 Nov 30 Dec 9
First 20° Oct 4 Oct 11 Oct 16 Oct 20 Oct 24 Oct 28 Nov 1 Nov 6 Nov 13
First 24° Sep 25 Oct 1 Oct 5 Oct 9 Oct 12 Oct 16 Oct 19 Oct 24 Oct 29
First 28° Sep 11 Sep 17 Sep 21 Sep 24 Sep 27 Oct 1 Oct 4 Oct 8 Oct 14
First 32° Aug 24 Aug 30 Sep 4 Sep 7 Sep 11 Sep 14 Sep 18 Sep 22 Sep 28
First 36° Aug 7 Aug 12 Aug 16 Aug 20 Aug 23 Aug 26 Aug 29 Sep 2 Sep 7

📍 Frost Dates for other nearby locations

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