Frost Dates: First and last frost dates for stephenson, mi
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 10.
- There is a 50% chance of being hit by a 32° frost starting around September 17
- You have a 80% chance of seeing 32° by September 25
- 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 24 | Oct 30 | Nov 4 | Nov 7 | Nov 11 | Nov 14 | Nov 18 | Nov 22 | Nov 28 |
First 20° | Oct 13 | Oct 19 | Oct 23 | Oct 26 | Oct 30 | Nov 2 | Nov 6 | Nov 10 | Nov 15 |
First 24° | Sep 27 | Oct 2 | Oct 5 | Oct 9 | Oct 11 | Oct 14 | Oct 17 | Oct 21 | Oct 26 |
First 28° | Sep 18 | Sep 22 | Sep 25 | Sep 27 | Sep 30 | Oct 2 | Oct 5 | Oct 8 | Oct 12 |
First 32° | Sep 6 | Sep 10 | Sep 13 | Sep 15 | Sep 17 | Sep 20 | Sep 22 | Sep 25 | Sep 29 |
First 36° | Aug 19 | Aug 25 | Aug 30 | Sep 2 | Sep 6 | Sep 9 | Sep 13 | Sep 17 | Sep 23 |
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 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 May 31, so we don't dare plant that early. We wait a few days and by June 13 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 16 | Apr 12 | Apr 8 | Apr 5 | Apr 2 | Mar 31 | Mar 28 | Mar 24 | Mar 19 |
Last 20° | May 2 | Apr 27 | Apr 23 | Apr 20 | Apr 17 | Apr 15 | Apr 12 | Apr 8 | Apr 3 |
Last 24° | May 13 | May 8 | May 4 | May 1 | Apr 28 | Apr 25 | Apr 22 | Apr 18 | Apr 13 |
Last 28° | May 29 | May 24 | May 20 | May 17 | May 15 | May 12 | May 9 | May 5 | Apr 30 |
Last 32° | Jun 17 | Jun 11 | Jun 8 | Jun 4 | Jun 1 | May 29 | May 26 | May 22 | May 17 |
Last 36° | Jul 3 | Jun 26 | Jun 21 | Jun 17 | Jun 13 | Jun 9 | Jun 5 | May 31 | May 24 |
Data is provided by the NOAA National Centers for Environmental Information.