Frost Dates: First and last frost dates for Lake George, CO

How to read these charts for the spring
As the growing season approaches, the days get longer, the weather begins to warm up, and the nights start being less cold. You're still getting frost, but the chance of nightly frosts gets less and less with each passing day. Eventually, the frost stops, and this is when your tender plants are fully safe. So, how do you plan for this? The probabilities on this page help you assess your risk of frost on any given day.

What's a safe temperature for tender plants? When the nightly temperature falls, frost can form, even above 32°, because the air is colder high above the ground and the frost can form up there and then fall down onto your garden and do some damage, even if it's 36° on the ground. So many factors come into play, including wind, concrete, houses, trees and other structures, etc etc etc. Because of all this, you might want to consider 36° as "the danger zone".

In your average springtime, you have a 90% chance that there will be no 36° nights by July 12. In other words, you can pretty much count on being safe from frost by that day. But we want to get those tomatoes in the ground as soon as possible, right? We see that there's still an 80% chance of 36° on June 11, so we don't dare plant that early. We wait a few days and by June 23 we are at the 50/50 point. At this point, we are close and we can start watching the weather forecast. If the upcoming week's forecast doesn't show below 40°, then it's probably okay to risk planting out your plants.

In the Spring
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
Last 16° May 3 Apr 28 Apr 25 Apr 22 Apr 19 Apr 16 Apr 13 Apr 9 Apr 4
Last 20° May 13 May 8 May 5 May 1 Apr 28 Apr 25 Apr 22 Apr 18 Apr 13
Last 24° May 24 May 19 May 15 May 12 May 9 May 6 May 3 Apr 29 Apr 24
Last 28° Jun 10 Jun 4 May 31 May 27 May 23 May 20 May 16 May 12 May 6
Last 32° Jun 27 Jun 21 Jun 16 Jun 13 Jun 9 Jun 6 Jun 2 May 29 May 23
Last 36° Jul 12 Jul 5 Jul 1 Jun 27 Jun 23 Jun 19 Jun 16 Jun 11 Jun 5

How to read these charts for the fall
As your growing season comes to an end, the nightly temperatures for Lake George, CO start to go down, and therefore every day that goes by increases the chance that you'll get frost. Your risk of frost really begins around September 3, and by September 23 you're almost certain to have received at least one frost event.

The charts on this page show the probabilities of receiving a certain temperature on a certain day. Some examples that might help:

  1. You have a small 20% chance of getting 32° by September 7.
  2. There is a 50% chance of being hit by a 32° frost starting around September 15
  3. You have a 80% chance of seeing 32° by September 23
  4. Said another way, you have a 1 in 5 chance at making it to that day without a 32° night.
In the Fall
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
First 16° Oct 4 Oct 10 Oct 14 Oct 18 Oct 21 Oct 25 Oct 28 Nov 1 Nov 7
First 20° Sep 26 Oct 1 Oct 5 Oct 8 Oct 11 Oct 14 Oct 17 Oct 21 Oct 26
First 24° Sep 18 Sep 23 Sep 27 Sep 30 Oct 3 Oct 6 Oct 9 Oct 13 Oct 18
First 28° Sep 12 Sep 16 Sep 19 Sep 22 Sep 24 Sep 27 Sep 29 Oct 3 Oct 7
First 32° Sep 3 Sep 7 Sep 10 Sep 13 Sep 15 Sep 17 Sep 20 Sep 23 Sep 27
First 36° Aug 18 Aug 23 Aug 28 Aug 31 Sep 3 Sep 7 Sep 10 Sep 14 Sep 20

Frost Dates for other nearby locations
  • Cheesman, CO
  • Bailey, CO
  • Antero Rsvr, CO
  • Grant, CO
  • Ruxton Park, CO
  • Kassler, CO
  • Canon City, CO
  • Evergreen, CO
  • Cabin Creek, CO
  • Castle Rock, CO

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