Frost Dates: First and last frost dates for P-ranch South Place, 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 9, 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 13 Apr 4 Mar 28 Mar 23 Mar 17 Mar 12 Mar 6 Feb 27 Feb 18
Last 20° May 11 May 1 Apr 24 Apr 17 Apr 12 Apr 6 Mar 31 Mar 24 Mar 14
Last 24° May 27 May 18 May 11 May 6 May 1 Apr 25 Apr 20 Apr 13 Apr 4
Last 28° Jun 23 Jun 15 Jun 9 Jun 5 May 31 May 27 May 22 May 17 May 9
Last 32° Jul 15 Jul 7 Jul 1 Jun 26 Jun 22 Jun 17 Jun 12 Jun 6 May 29
Last 36° Jul 26 Jul 20 Jul 16 Jul 12 Jul 9 Jul 5 Jul 2 Jun 27 Jun 21

ℹ️ How to read these charts for the fall

As summer ends in P-ranch South Place, 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 29, 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 17, 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 17 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 28 Nov 5 Nov 11 Nov 16 Nov 21 Nov 25 Nov 30 Dec 6 Dec 14
First 20° Oct 3 Oct 12 Oct 18 Oct 23 Oct 28 Nov 1 Nov 6 Nov 12 Nov 21
First 24° Sep 20 Sep 27 Oct 2 Oct 6 Oct 10 Oct 14 Oct 19 Oct 24 Oct 31
First 28° Sep 6 Sep 11 Sep 16 Sep 19 Sep 23 Sep 26 Sep 30 Oct 4 Oct 10
First 32° Aug 24 Aug 29 Sep 2 Sep 5 Sep 8 Sep 11 Sep 14 Sep 17 Sep 22
First 36° Aug 3 Aug 9 Aug 13 Aug 17 Aug 20 Aug 24 Aug 28 Sep 1 Sep 7

📍 Frost Dates for other nearby locations

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