Frost Dates: First and last frost dates for Annapolis Police Brks, MD

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 3. 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 10, so we don't dare plant that early. We wait a few days and by April 19 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° Mar 9 Mar 2 Feb 25 Feb 21 Feb 17 Feb 13 Feb 9 Feb 3 Jan 26
Last 20° Mar 22 Mar 14 Mar 8 Mar 3 Feb 27 Feb 22 Feb 17 Feb 11 Feb 3
Last 24° Mar 28 Mar 23 Mar 20 Mar 17 Mar 15 Mar 12 Mar 10 Mar 6 Mar 2
Last 28° Apr 12 Apr 7 Apr 3 Mar 31 Mar 29 Mar 26 Mar 23 Mar 20 Mar 15
Last 32° Apr 17 Apr 13 Apr 11 Apr 8 Apr 6 Apr 4 Apr 2 Mar 30 Mar 27
Last 36° May 3 Apr 28 Apr 25 Apr 22 Apr 19 Apr 16 Apr 13 Apr 10 Apr 5

How to read these charts for the fall
As your growing season comes to an end, the nightly temperatures for Annapolis Police Brks, MD 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 13, and by November 11 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 19.
  2. There is a 50% chance of being hit by a 32° frost starting around October 31
  3. You have a 80% chance of seeing 32° by November 11
  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 3 Dec 12 Dec 18 Dec 23 Dec 28 Jan 2 Jan 7 Jan 14 Jan 24
First 20° Nov 26 Dec 2 Dec 6 Dec 10 Dec 14 Dec 17 Dec 21 Dec 25 Jan 1
First 24° Nov 9 Nov 15 Nov 19 Nov 23 Nov 26 Nov 29 Dec 3 Dec 7 Dec 13
First 28° Oct 29 Nov 3 Nov 7 Nov 10 Nov 13 Nov 17 Nov 20 Nov 24 Nov 29
First 32° Oct 13 Oct 19 Oct 23 Oct 27 Oct 31 Nov 3 Nov 7 Nov 11 Nov 18
First 36° Oct 7 Oct 13 Oct 17 Oct 20 Oct 23 Oct 26 Oct 30 Nov 2 Nov 8

Frost Dates for other nearby locations
  • Baltimore Wash, MD
  • Upper Marlboro, MD
  • Glenn Dale Bell Stn, MD
  • Royal Oak, MD
  • Laurel, MD
  • Beltsville, MD
  • Natl Arboretum Dc, MD
  • Chestertown, MD
  • Clarksville, MD
  • Washington Reagan, VA

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