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