Soil temperature is a good indicator for planting.

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      Good morning   Temperature is at 46 degrees at 7:30 AM  but only a high today of 57 low tonight of 40. Cloudy skies and we have wind blowing.  Not as nice as yesterday. 
We had four planting yesterday so made some headway in planting.  The planters are keeping me busy moving plants and cleaning up for them to plant.  I have never counted the number of flats left, just do one at a time.  I hooked up more water hoses, so easier for me to water each side and then the planters had their own hose to wet the potting mixture.  Yes spring is here but the up and down of the temperature it is time to get your garden soil ready so when it warms up then you can plant.
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I am posting a chart with the soil temperature for the optimum temperature for planting that vegetable.  You can take your own soil temperature or go to this website at Iowa State University.  Soil is warming up.  https://www.mesonet.agron.iastate.edu/agclimate/soilt.php
Vegetable seed       Low end of optimum soil temperature range (°F)    High end of optimum soil temperature range (°F)
Pea                40            75
Lettuce          40       80
Spinach         45       75
Carrot            45       85
Cauliflower    45       85
Radish            45       90
Cabbage        45       95
Beet                50       85
Chard             50       85
Onion              50       95
Bean               60       85
Tomato         60       85
Corn              60       95
Cucumber    60       95
Pepper          65       95
Pumpkin       70       90
Squash          70       95
Melon            70       95
Hope this helps and you must make sure the soil isn’t too wet.  If you take the soil and press it into a ball and it holds that ball shape, then the soil is too wet. 
Good luck and enjoy your gardening planting.  Stay safe, today stay warm.
Taken from https://www.homefortheharvest.com/soil-temperature-for-planting-vegetables-chart/
Till next time this is Becky Litterer, Becky’s Greenhouse, Dougherty Iowa [email protected], 641-794-3337  cell 641-903-9365