Frost Dates: First and last frost dates for Dixie, ID

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 August 4, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around July 20, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before July 11, 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 27 Apr 19 Apr 13 Apr 8 Apr 4 Mar 30 Mar 25 Mar 19 Mar 11
Last 20° May 9 May 2 Apr 28 Apr 24 Apr 21 Apr 17 Apr 13 Apr 9 Apr 2
Last 24° Jun 7 May 29 May 22 May 17 May 11 May 6 Apr 30 Apr 24 Apr 14
Last 28° Jul 7 Jun 27 Jun 19 Jun 13 Jun 7 May 31 May 25 May 17 May 7
Last 32° Jul 31 Jul 23 Jul 17 Jul 12 Jul 7 Jul 2 Jun 27 Jun 21 Jun 13
Last 36° Aug 4 Jul 30 Jul 26 Jul 23 Jul 20 Jul 17 Jul 14 Jul 11 Jul 6

ℹ️ How to read these charts for the fall

As summer ends in Dixie, ID, 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 7, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By August 19, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By August 30, 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 August 30 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° Sep 25 Oct 4 Oct 10 Oct 15 Oct 20 Oct 24 Oct 29 Nov 4 Nov 13
First 20° Sep 15 Sep 21 Sep 26 Oct 1 Oct 5 Oct 9 Oct 13 Oct 18 Oct 25
First 24° Sep 4 Sep 10 Sep 14 Sep 18 Sep 21 Sep 25 Sep 28 Oct 2 Oct 8
First 28° Aug 17 Aug 24 Aug 28 Sep 1 Sep 5 Sep 9 Sep 13 Sep 17 Sep 24
First 32° Aug 1 Aug 7 Aug 11 Aug 15 Aug 19 Aug 22 Aug 26 Aug 30 Sep 5
First 36° Jul 28 Aug 1 Aug 4 Aug 6 Aug 9 Aug 11 Aug 14 Aug 17 Aug 21

📍 Frost Dates for other nearby locations

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