If you want to get your vegetable garden or lawn off to a fast start, you need to know if your soil is warm enough.
Click on the map link below to find your soil temperature by zip code. Use this map as a guide for planting your garden, applying crabgrass preventer, fertilizer, weed and feed and grass seed. Soil temperature, not air temperature is the trigger for seed germination.
Crabgrass preventer needs to be applied when soil temperature is about 55 degrees for 5 consecutive days.
Most grass seed will germinate around 55 degrees.
Soil Temperatures For Hardy and Semi Hardy Vegetables about 50 degrees: broccoli, cabbage, beets, carrots, cauliflower kohlrabi, onions, lettuce, peas, radish, turnips.
Soil Temperatures For Tender Vegetables about 60 degrees: beans, celery, corn, eggplant, tomatoes, cucumbers, spinach, pumpkin and squash.
To find your current local soil temperature, click on the map or the link:
To find your local soil temperature:
- Enter your city, state or zip code and click green search button
- Click “view map in full screen”
- Click “show legend” to bring up local soil temperature
Soil temperatures are taken at 4 inches below the soil surface under bare soil.
Whether you’re planting seeds, planting a garden, applying fertilizer or targeting weeds, it’s important to check your soil temperature before beginning. If temperatures are not right for the job, the results will be disappointing.
- Plant spring bulbs in the fall when the soil temperature drops below 60° F.
- Apply crabgrass control in spring, when soil temperatures reach 55° F for 4-5 days in a row.
- Plant cool-season grass seed once soil temperatures are in the 50s F.
- Give fall planting shrubs and trees time to grow roots before soil temperatures are below 40° F.
You Can Also Purchase A Soil Thermometer
Outdoor garden and soil thermometers help you keep your plants healthy and improve seeding, transplanting and crabgrass/fertilizer application times. Ensure great results by following application guidelines at the safe and proper soil temperature.
Weather resistant stainless steel soil thermometers are perfect for temperature readings for indoor potting or outdoor gardening. They generally will cost from $10-$35
Soil Temperature Map: Click here for daily Updated Map