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 below to find your soil temperature. 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.

Note:  On some browsers, the map will not display properly.
Here is the direct link: Soil Temperature Map

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
Http iframes are not shown in https pages in many major browsers. Please read this post for details.

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.

For Example:

  •   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 new shrubs time to grow roots before soil temperatures fall 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

By Victoria Stone