Last year I had to replant all my beans - the first ones got a couple inches tall, then just sat there and shivered in the cold. When it finally did warm up for real, they still didn’t grow. Weather maven Cliff Mass had the same experience - he recently posted about soil temperatures and seed germination, with a link to the Washington State University AgWeatherNet site. We’re having another cold, late spring, so this is really handy.
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The WSU link is a really nice site…but…I live in the opposite corner of the country, so it’s not as helpful for me. However, it DID get me curious enough to go looking for a link that covered my area. I found this site from the University of Georgia: http://www.griffin.uga.edu/aemn/cgi-bin/AEMN.pl?site=GAAP
Despite the 1990’s-style site design, there’s a lot of good information here.
I found it by Googling “soil temperature georgia.” I suspect that most parts of the country have a similar service, often provided by one of their state universities.