Frost Dates: First and last frost dates for Kelliher, MN
The charts on this page show the probabilities of receiving a certain temperature on a certain day. Some examples that might help:
- You have a small 20% chance of getting 32° by September 14.
- There is a 50% chance of being hit by a 32° frost starting around September 21
- You have a 80% chance of seeing 32° by September 27
- Said another way, you have a 1 in 5 chance at making it to that day without a 32° night.
Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
---|---|---|---|---|---|---|---|---|---|
First 16° | Oct 23 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 12 | Nov 16 |
First 20° | Oct 6 | Oct 13 | Oct 17 | Oct 21 | Oct 25 | Oct 28 | Nov 1 | Nov 6 | Nov 12 |
First 24° | Sep 28 | Oct 3 | Oct 7 | Oct 10 | Oct 13 | Oct 16 | Oct 20 | Oct 24 | Oct 29 |
First 28° | Sep 16 | Sep 20 | Sep 24 | Sep 26 | Sep 29 | Oct 1 | Oct 4 | Oct 7 | Oct 12 |
First 32° | Sep 11 | Sep 14 | Sep 16 | Sep 19 | Sep 21 | Sep 23 | Sep 25 | Sep 27 | Oct 1 |
First 36° | Aug 22 | Aug 27 | Aug 31 | Sep 3 | Sep 6 | Sep 9 | Sep 13 | Sep 16 | Sep 22 |
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 June 20. 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 May 23, so we don't dare plant that early. We wait a few days and by June 3 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.
Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
---|---|---|---|---|---|---|---|---|---|
Last 16° | Apr 19 | Apr 15 | Apr 12 | Apr 9 | Apr 7 | Apr 4 | Apr 2 | Mar 30 | Mar 25 |
Last 20° | Apr 25 | Apr 21 | Apr 19 | Apr 16 | Apr 14 | Apr 12 | Apr 9 | Apr 7 | Apr 3 |
Last 24° | May 9 | May 4 | May 1 | Apr 28 | Apr 25 | Apr 22 | Apr 19 | Apr 15 | Apr 10 |
Last 28° | May 23 | May 18 | May 14 | May 11 | May 7 | May 4 | May 1 | Apr 27 | Apr 21 |
Last 32° | Jun 10 | Jun 4 | May 30 | May 27 | May 23 | May 20 | May 16 | May 12 | May 6 |
Last 36° | Jun 20 | Jun 14 | Jun 10 | Jun 7 | Jun 3 | May 31 | May 28 | May 23 | May 18 |
Data is provided by the NOAA National Centers for Environmental Information.