Timestamps. Soil temperature lets you know when to plant vegetable seeds and transplants into the garden. Here is how you make a soil temperature chart.

My supporting blog post…
When to Plant Vegetable Seeds and Transplants Outdoors
https://therustedgardenblog.com/when-to-plant-vegetable-seeds-and-transplants/

0:00 Garden Soil Temperature Matters
0:41 Making a Soil Temperature Chart
1:31 What Soil Depth Do I Measure Temperature?
2:30 Fill Out the Soil Temperature Chart
6:19 How to Use the Chart for Planting
8:02 No Benefit to Early Seeding & Planting – Here’s Why
10:57 General Soil Temperatures for Seeding & Planting Vegetables
14:18 List of Cool & Warm-Weather Crops Soil Temp Preferences
16:06 Still Picture of Soil Temperature Chart

Below 40°F (4°C): Most seeds will not germinate.

40–50°F (4– 10°C): Some cool-season crops like peas, spinach, and lettuce can germinate.

50–60°F (10–16°C): Perfect for seeding many cool-season vegetables like broccoli, carrots, and beets. Cool-season transplants do better at the higher end of the range.

60–70°F (16–21°C): A general range for transplants/seeding for both cool and warm-season vegetables.

70–85°F (21–29°C): Best for transplants/seeding warm-season crops like tomatoes, peppers, and cucumbers. Crops preferring cool soil tend to flower and produce seeds (bolt).

Above 85°F (29°C): Germination can become sporadic for many crops, and high soil temperatures can stress plants. The process of bolting definitely begins for any remaining cool=season crops.

Above 95°F (25°C): Gemination may not occur and plants often drop flower or shut down fruit formation and production.

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9 Comments

  1. For cool season crops, I use this method: Go outside, barefoot, shorts, and tee-shirt. If your first thought is, "Dang! It's cold. I need to go back inside and bundle up," then it is too cold to sow seeds. If your first thought is, "It's a bit chilly, but okay," then it is safe to sow seeds. Note, this doesn't apply to people residing in south Florida. They can go outside barefoot, shorts, and tee-shirt year-round. 🤣🤣🤣

  2. Thanks so much for your support! Cheers & Thanks, Gary!

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    Earn 15% and become a TRG Affiliate for our seed & garden shop

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    Popular Items from My Seed and Garden Shop…

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    Seed Starting, Growing, and Pest Management

    Neem Oil: https://bit.ly/43IJl9C

    Peppermint Oil: https://bit.ly/43IJl9C

    Rosemary Oil: https://bit.ly/43IJl9C

    100 Gallon Fabric Pots (approximately 100 Gallons): https://bit.ly/3PMoZ9S

    #20 Gallon Fabric Pots (21.32 Gallons): https://bit.ly/43Hz9OA

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    The Rusted Garden Heirloom Tomato Seed Selections: https://bit.ly/49towQK

    The Rusted Garden Pepper Seed Selections: https://bit.ly/3U1G1TM

    My Amazon Garden Store Front

    As an Amazon Associate I earn from qualifying purchases.

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    Available Now https://amzn.to/40rfkIb

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    Products I Use and Recommend and I have an affiliation with them:

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    Use the Discount Code THERUSTEDGARDEN on GreenStalk 'Vertical Tier Systems'. Use this link and enter my code for the discount https://greenstalkgarden.com/?rstr=therustedgarden

    AgroThrive Organic Bio-Fertilizers

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    Vegega Metal Raised Beds

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  3. Hi Gary. In raised beds wouldn't a thick layer of mulch help to keep the soil temps warmer by a degree or so? That coupled with a low tunnel or a couple layers of frost blankets. Of course, I am only thinking of cold hardy plants not warm season crops.

  4. Unfortunately, you really can't rely on 'average' temperatures in a lot of places anymore. Our local climate here has gone completely haywire, and I just anticipate having to succession sow seeds so that I'll have something ready at the right time

  5. Why can't you take one of those long thermometers you use to check your compost pile and push it in the ground (about 4 inches) at several places and get a ground temp that way???????????? I'd rather spend $20 bucks and get a real reading??

  6. This is super helpful! Thank you! Love that rain in the background….you could just let the camera run and just get the sound of the rain 😉.

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