Frost Dates: First and last frost dates for Vichy Rolla National, MO

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 May 5, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around April 22, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before April 13, 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 19 Mar 11 Mar 5 Feb 28 Feb 24 Feb 19 Feb 15 Feb 9 Feb 1
Last 20° Mar 29 Mar 22 Mar 17 Mar 12 Mar 8 Mar 4 Feb 28 Feb 22 Feb 15
Last 24° Apr 4 Mar 29 Mar 26 Mar 22 Mar 19 Mar 16 Mar 13 Mar 9 Mar 4
Last 28° Apr 12 Apr 8 Apr 5 Apr 3 Mar 31 Mar 29 Mar 26 Mar 23 Mar 19
Last 32° Apr 24 Apr 19 Apr 15 Apr 12 Apr 9 Apr 6 Apr 3 Mar 31 Mar 26
Last 36° May 5 Apr 30 Apr 27 Apr 24 Apr 22 Apr 19 Apr 16 Apr 13 Apr 8

ℹ️ How to read these charts for the fall

As summer ends in Vichy Rolla National, MO, 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 October 14, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By October 24, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By November 2, 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 November 2 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 14 Nov 20 Nov 24 Nov 28 Dec 1 Dec 5 Dec 9 Dec 13 Dec 19
First 20° Nov 6 Nov 12 Nov 17 Nov 21 Nov 25 Nov 28 Dec 2 Dec 7 Dec 13
First 24° Oct 29 Nov 4 Nov 8 Nov 12 Nov 15 Nov 18 Nov 22 Nov 26 Dec 2
First 28° Oct 18 Oct 24 Oct 29 Nov 2 Nov 5 Nov 9 Nov 12 Nov 17 Nov 23
First 32° Oct 9 Oct 14 Oct 17 Oct 21 Oct 24 Oct 26 Oct 30 Nov 2 Nov 7
First 36° Sep 26 Oct 1 Oct 4 Oct 7 Oct 10 Oct 13 Oct 16 Oct 19 Oct 24

📍 Frost Dates for other nearby locations

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