Frost Dates: First and last frost dates for Dufur, 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 6, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around June 15, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before June 1, 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 1 Feb 18 Feb 10 Feb 3 Jan 27 Jan 21 Jan 14 Jan 6 Dec 26
Last 20° Apr 5 Mar 23 Mar 13 Mar 5 Feb 25 Feb 18 Feb 9 Jan 31 Jan 17
Last 24° Apr 29 Apr 20 Apr 13 Apr 7 Apr 2 Mar 27 Mar 21 Mar 15 Mar 5
Last 28° May 24 May 17 May 11 May 7 May 2 Apr 28 Apr 23 Apr 18 Apr 11
Last 32° Jun 15 Jun 8 Jun 2 May 29 May 25 May 21 May 16 May 11 May 4
Last 36° Jul 6 Jun 29 Jun 23 Jun 19 Jun 15 Jun 11 Jun 6 Jun 1 May 25

ℹ️ How to read these charts for the fall

As summer ends in Dufur, 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 September 23, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By October 2, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By October 11, 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 October 11 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° Nov 5 Nov 16 Nov 25 Dec 2 Dec 9 Dec 16 Dec 23 Jan 1 Jan 13
First 20° Oct 25 Nov 4 Nov 11 Nov 17 Nov 23 Nov 28 Dec 4 Dec 11 Dec 21
First 24° Oct 12 Oct 20 Oct 26 Nov 1 Nov 6 Nov 10 Nov 16 Nov 22 Nov 30
First 28° Sep 28 Oct 3 Oct 7 Oct 11 Oct 14 Oct 17 Oct 20 Oct 24 Oct 29
First 32° Sep 18 Sep 23 Sep 27 Sep 30 Oct 2 Oct 5 Oct 8 Oct 11 Oct 16
First 36° Aug 29 Sep 4 Sep 8 Sep 12 Sep 15 Sep 18 Sep 22 Sep 26 Oct 2

📍 Frost Dates for other nearby locations

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