Frost Dates: First and last frost dates for Marietta, Georgia

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 May 6. 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 April 12, so we don't dare plant that early. We wait a few days and by April 22 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. If conditions change and a surprise frost does threaten, there's always things you can do to protect plants from frost.

In the Spring
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
Last 16° Mar 4 Feb 23 Feb 17 Feb 11 Feb 6 Feb 1 Jan 27 Jan 21 Jan 12
Last 20° Mar 16 Mar 8 Mar 2 Feb 25 Feb 20 Feb 15 Feb 10 Feb 4 Jan 27
Last 24° Mar 31 Mar 23 Mar 18 Mar 13 Mar 9 Mar 5 Feb 28 Feb 23 Feb 16
Last 28° Apr 14 Apr 8 Apr 4 Apr 1 Mar 29 Mar 26 Mar 22 Mar 19 Mar 13
Last 32° Apr 24 Apr 20 Apr 17 Apr 14 Apr 12 Apr 9 Apr 6 Apr 3 Mar 30
Last 36° May 6 May 1 Apr 28 Apr 25 Apr 22 Apr 19 Apr 16 Apr 12 Apr 7

How to read these charts for the fall
As your growing season comes to an end, the nightly temperatures for Marietta, Georgia 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 October 10, and by November 3 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 October 15.
  2. There is a 50% chance of being hit by a 32° frost starting around October 24
  3. You have a 80% chance of seeing 32° by November 3
  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° Dec 4 Dec 13 Dec 19 Dec 25 Dec 30 Jan 4 Jan 9 Jan 16 Jan 25
First 20° Nov 19 Nov 28 Dec 5 Dec 11 Dec 16 Dec 21 Dec 27 Jan 2 Jan 12
First 24° Nov 9 Nov 15 Nov 18 Nov 22 Nov 25 Nov 28 Dec 1 Dec 5 Dec 11
First 28° Oct 21 Oct 27 Nov 1 Nov 4 Nov 8 Nov 11 Nov 15 Nov 20 Nov 26
First 32° Oct 10 Oct 15 Oct 18 Oct 21 Oct 24 Oct 27 Oct 30 Nov 3 Nov 8
First 36° Oct 3 Oct 7 Oct 10 Oct 12 Oct 15 Oct 17 Oct 19 Oct 22 Oct 26

Now that you know your frost dates, use our Garden Planting Calendar for Marietta, Georgia to know when to sow and transplant your various vegetable plants!

Data is provided by the NOAA National Centers for Environmental Information. Photography by Garden.org member TBGDN.

Sponsored by Victory Seed Company
Victory Seed Company The Victory Seed Company is family owned and operated, working to help fellow gardeners succeed by selling popular vegetable, herb and flower seeds. Since the 1990s they have been heavily involved with the preservation of rare, open-pollinated, heirloom seeds. Visit them at www.VictorySeeds.com.
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