People often ask me “when can i start planting my vegetable garden?” The short answer is now. The soil temp in my gardens has reached 50 degrees. While under the black plastic (I use to heat up the soil) has a soil temperature of 60. All vegetable gardeners should own their own $10 soil thermometer. In general we reach these soil temperatures around April 15th, tax day, hence roots and taxes.
The majority of crops you would plant at this time of year (potatoes, lettuces, kale, spinach, beets, carrots radishes, etc…) will germinate at these soil temps. See link for exact soil temps… http://ag.arizona.edu/pubs/garden/mg/vegetable/temperature.html
But… if you see many days of cold wet weather coming, hold off on planing. Because cold wet weather for to many days will often rot the seed. I will plant this weekend because next week looks warm (60) and dry. Plant a victory garden this year, feed your family and thumb your nose at the corporate agro business!