Soil Temperature Map

Last updated on April 20th, 2024 at 02:44 pm

Soil temperature is indeed crucial when it comes to planting a garden as it directly affects seed germination, root development, nutrient uptake, and overall plant growth. If you want to get your vegetable garden or lawn off to a fast start, you need to know if your soil temperature is warm enough.

Find Your Soil Temperature Map Here

Click on the map link 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.

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.

Soil temperature plays a crucial role in successful gardening. It’s essentially the measurement of warmth in the ground. When it comes to planting, understanding the ideal soil temperatures is key. Most vegetable seeds germinate well within a specific range—typically between 60°F (16°C) and 75°F (24°C). However, some seeds have their preferences, and planting too early can lead to issues like seed rot.

What is Soil Temperature?

Soil temperature is simply the measurement of the warmth in the ground. Ideal soil temperatures for planting most plants are usually between 65 to 75 degrees Fahrenheit. For each type of seed which may be grass, beans,pumpkins, carrots, etc, there is a range of temperatures at which that particular type of seed will germinate.

One of the biggest mistakes people make is planting too early. We get excited when it’s sunny for a few day and start putting plants and seeds in the ground. But the seeds are not ready to germinate and plant roots will rot.

To find your local soil temperature at greencastonline.com:

  • 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

Use The Old Farmers Almanac

Yup, it’s been around a long time, but probably has the most useful information. The gardening experts at The Old Farmer’s Almanac can help you out if you still have questions. Planting tools are by zip code and they use weather station reports and using a “days until harvest” for popular vegetables grown in your area. Find out when to sow indoors, transplant, and start your garden or grass seed based on years of solid information.

You can find the current edition at Amazon: Old Farmers Almanac

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. Soil temperatures are taken at 4 inches below the soil surface under bare soil

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 fall planting shrubs and trees time to grow roots before soil temperatures are below 40° F.

You Can Also Purchase A Soil Thermometer

You can find soil temperature thermometers at Lowes and on Amazon here: Amazon Garden Supplies.

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

Weather resistant stainless steel models are perfect for temperature readings for indoor potting or outdoor gardening. They generally will cost from $10-$35

Soil Temperature Map: Click here for your Daily Updated Map

Soil temperature is crucial for successful gardening.

  1. Seed Germination: Different seeds have specific temperature requirements for germination. Planting within the optimal temperature range ensures successful sprouting.
  2. Root Health: Cold soil can lead to root rot, while excessively warm soil can stress plants. Monitoring soil temperature helps prevent these issues.
  3. Plant Growth: Soil temperature affects nutrient availability and microbial activity. Proper temperatures promote healthy plant growth.
  4. Timing: Knowing soil temperature helps determine the right time for planting different crops. Cool-season and warm-season plants thrive at specific temperatures.

Investing in a weather-resistant soil thermometer allows you to make informed decisions and cultivate a productive garden.

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