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 14. 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 March 15, so we don't dare plant that early. We wait a few days and by April 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. If conditions change and a surprise frost does threaten, there's always things you can do to protect plants from frost.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| Last 16° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Last 20° | Dec 28 | -- | -- | -- | -- | -- | -- | -- | -- |
| Last 24° | Feb 7 | Jan 23 | Jan 7 | -- | -- | -- | -- | -- | -- |
| Last 28° | Mar 1 | Feb 15 | Feb 5 | Jan 28 | Jan 19 | Jan 10 | Dec 31 | Dec 18 | -- |
| Last 32° | Apr 7 | Mar 25 | Mar 15 | Mar 6 | Feb 27 | Feb 19 | Feb 10 | Feb 1 | Jan 18 |
| Last 36° | May 14 | May 2 | Apr 23 | Apr 15 | Apr 8 | Apr 1 | Mar 24 | Mar 15 | Mar 3 |
The charts on this page show the probabilities of receiving a certain temperature on a certain day. Some examples that might help:
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| First 16° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| First 20° | Dec 31 | -- | -- | -- | -- | -- | -- | -- | -- |
| First 24° | Dec 18 | Jan 6 | Jan 31 | -- | -- | -- | -- | -- | -- |
| First 28° | Nov 22 | Dec 2 | Dec 8 | Dec 14 | Dec 20 | Dec 26 | Jan 3 | Jan 14 | -- |
| First 32° | Oct 26 | Nov 5 | Nov 12 | Nov 18 | Nov 24 | Nov 30 | Dec 6 | Dec 13 | Dec 23 |
| First 36° | Oct 23 | Oct 30 | Nov 4 | Nov 8 | Nov 12 | Nov 15 | Nov 19 | Nov 24 | Dec 1 |
Now that you know your frost dates, use our Garden Planting Calendar for Livermore, CA to know when to sow and transplant your various vegetable plants!
Data is provided by the NOAA National Centers for Environmental Information. Photography by Garden.org member TBGDN.
The Victory Seed Company is family owned and operated, working to help fellow gardeners succeed by selling popular vegetable, herb and flower seeds. Since the 1990s they have been heavily involved with the preservation of rare, open-pollinated, heirloom seeds. Visit them at www.VictorySeeds.com.
