Collection: Soil Thermometers

Soil thermometers help gardeners measure below-surface temperatures when planning seed starting, transplanting, and other temperature-sensitive garden work. This collection also includes compost thermometer options for monitoring a compost pile at greater depth.

Choosing and using a soil thermometer

• Probe length: Match the probe to the material and depth you need to measure. A garden-soil reading and a compost-pile reading may require different tools.
• Dial and scale: Confirm the temperature range and units shown on the individual product page.
• Placement: Insert the probe carefully, wait for the reading to stabilize according to the product instructions, and sample more than one spot when conditions vary.

Soil temperature changes with depth, time of day, moisture, sun exposure, and cover. Use crop-specific planting guidance for the seed or transplant you are growing rather than relying on one universal threshold. Clean the probe between uses and avoid forcing it through hard soil, stones, or roots.