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 6. 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 April 12, so we don't dare plant that early. We wait a few days and by April 22 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.
|Last 16°||Mar 4||Feb 23||Feb 17||Feb 11||Feb 6||Feb 1||Jan 27||Jan 21||Jan 12|
|Last 20°||Mar 16||Mar 8||Mar 2||Feb 25||Feb 20||Feb 15||Feb 10||Feb 4||Jan 27|
|Last 24°||Mar 31||Mar 23||Mar 18||Mar 13||Mar 9||Mar 5||Feb 28||Feb 23||Feb 16|
|Last 28°||Apr 14||Apr 8||Apr 4||Apr 1||Mar 29||Mar 26||Mar 22||Mar 19||Mar 13|
|Last 32°||Apr 24||Apr 20||Apr 17||Apr 14||Apr 12||Apr 9||Apr 6||Apr 3||Mar 30|
|Last 36°||May 6||May 1||Apr 28||Apr 25||Apr 22||Apr 19||Apr 16||Apr 12||Apr 7|
The charts on this page show the probabilities of receiving a certain temperature on a certain day. Some examples that might help:
|First 16°||Dec 4||Dec 13||Dec 19||Dec 25||Dec 30||Jan 4||Jan 9||Jan 16||Jan 25|
|First 20°||Nov 19||Nov 28||Dec 5||Dec 11||Dec 16||Dec 21||Dec 27||Jan 2||Jan 12|
|First 24°||Nov 9||Nov 15||Nov 18||Nov 22||Nov 25||Nov 28||Dec 1||Dec 5||Dec 11|
|First 28°||Oct 21||Oct 27||Nov 1||Nov 4||Nov 8||Nov 11||Nov 15||Nov 20||Nov 26|
|First 32°||Oct 10||Oct 15||Oct 18||Oct 21||Oct 24||Oct 27||Oct 30||Nov 3||Nov 8|
|First 36°||Oct 3||Oct 7||Oct 10||Oct 12||Oct 15||Oct 17||Oct 19||Oct 22||Oct 26|
Now that you know your frost dates, use our Garden Planting Calendar for Marietta, Georgia to know when to sow and transplant your various vegetable plants!