Frost Dates: First and last frost dates for Pinedale, WY

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 3, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around July 18, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before July 7, 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° May 15 May 10 May 6 May 3 Apr 29 Apr 26 Apr 23 Apr 19 Apr 13
Last 20° Jun 1 May 25 May 21 May 17 May 13 May 10 May 6 May 1 Apr 25
Last 24° Jun 15 Jun 9 Jun 4 May 31 May 27 May 23 May 19 May 14 May 8
Last 28° Jun 30 Jun 24 Jun 20 Jun 16 Jun 13 Jun 9 Jun 5 Jun 1 May 26
Last 32° Jul 21 Jul 15 Jul 11 Jul 8 Jul 5 Jul 2 Jun 28 Jun 25 Jun 19
Last 36° Aug 3 Jul 29 Jul 25 Jul 21 Jul 18 Jul 15 Jul 11 Jul 7 Jul 2

ℹ️ How to read these charts for the fall

As summer ends in Pinedale, WY, 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 18, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By August 29, 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 29 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 14 Sep 19 Sep 23 Sep 26 Sep 29 Oct 2 Oct 6 Oct 10 Oct 15
First 20° Sep 2 Sep 8 Sep 11 Sep 15 Sep 18 Sep 21 Sep 24 Sep 28 Oct 4
First 24° Aug 25 Aug 31 Sep 4 Sep 7 Sep 10 Sep 13 Sep 17 Sep 21 Sep 26
First 28° Aug 12 Aug 17 Aug 21 Aug 25 Aug 28 Aug 31 Sep 4 Sep 8 Sep 13
First 32° Aug 2 Aug 7 Aug 12 Aug 15 Aug 18 Aug 22 Aug 25 Aug 29 Sep 4
First 36° Jul 29 Jul 31 Aug 3 Aug 5 Aug 7 Aug 9 Aug 11 Aug 14 Aug 17

📍 Frost Dates for other nearby locations

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