Frost Dates: First and last frost dates for Marion Frks Fish Hatch, 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 2, 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 2 Feb 17 Feb 7 Jan 30 Jan 22 Jan 13 Jan 3 Dec 21 --
Last 20° Mar 22 Mar 7 Feb 24 Feb 15 Feb 7 Jan 29 Jan 19 Jan 8 Dec 21
Last 24° Apr 9 Mar 30 Mar 23 Mar 17 Mar 11 Mar 6 Feb 28 Feb 21 Feb 11
Last 28° May 13 May 6 May 1 Apr 27 Apr 23 Apr 19 Apr 14 Apr 9 Apr 2
Last 32° Jun 18 Jun 11 Jun 5 Jun 1 May 28 May 23 May 19 May 13 May 6
Last 36° Jul 6 Jun 29 Jun 24 Jun 19 Jun 15 Jun 11 Jun 7 Jun 2 May 26

ℹ️ How to read these charts for the fall

As summer ends in Marion Frks Fish Hatch, 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 11, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By September 23, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By October 6, 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 6 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 21 Dec 3 Dec 12 Dec 20 Dec 28 Jan 5 Jan 15 Jan 30 --
First 20° Nov 9 Nov 18 Nov 25 Dec 1 Dec 7 Dec 13 Dec 19 Dec 26 Jan 7
First 24° Oct 26 Nov 4 Nov 10 Nov 16 Nov 21 Nov 26 Dec 2 Dec 8 Dec 17
First 28° Sep 26 Oct 3 Oct 7 Oct 11 Oct 15 Oct 18 Oct 22 Oct 27 Nov 2
First 32° Sep 4 Sep 11 Sep 15 Sep 19 Sep 23 Sep 27 Oct 1 Oct 6 Oct 12
First 36° Aug 18 Aug 23 Aug 27 Aug 31 Sep 3 Sep 6 Sep 10 Sep 14 Sep 19

📍 Frost Dates for other nearby locations

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