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