How do tomato or lettuce seeds know when the temperature is right for germination? Well, this question will remain unanswered for now. We just know that it’s important that seeds have the right temperatures for germination. Germination temperature usually means soil temperature. During the day, soil stores heat. At night, soil releases heat into the atmosphere.

The University of Nebraska Video included below advocates for planting when soil temperatures are 10 degrees F (about 5 degrees C) above minimum germination temperatures. This concept is supported in our chart.

Seed Temperature Germination Chart

Source: Mostly from University of Oregon. Other information from other sources.

CropGermination
Minimum Soil
Temperature (°F)
Germination
Optimum Soil
Temperature
Range (°F)
Germination
Maximum Soil
Temperature (°F)
Days to
Germination
at Optimal
Temps
Asparagus5060-859514-18
Bean, lima6075-85854-10
Bean, snap6075-85954-10
Beet4060-85954-10
Broccoli4060-85957-10
Brussels sprouts4060-85953-10
Cabbage4060-85955-10
Carrot4065-85956
Cauliflower4065-85954-10
Celery4060-709510
Chinese cabbage4060-85954-10
Collards4060-85955-10
Corn5065-951054-10
Cucumber6065-951055-7
Eggplant6075-859510-15
Endive/Escarole3560-758510-14
Garlic3565-85957-14
Kale4060-85955-7
Kohlrabi4060-951055-10
Leeks3565-85958-16
Lettuce3560-75852-10
Muskmelon6075-951054-10
Mustard3560-75854-6
Okra6085-951057-12
Onion3565-85954-12
Parsley4065-85955-6 weeks
Parsnip3565-75855-28
Pea4065-75855-7
Pepper6065-75957-10
Pumpkin6085-951054-10
Radicchio3560-75855-7
Radish4065-85954-10
Spinach3565-75756-14
Squash6085-951057-10
Swiss chard4065-85957
Tomato5065-85955-7
Turnip4060-951053-10
Watermelon6070-951054-10

Our dilemma of germination temperatures of tomato or lettuce seeds is answered, as well as for many other vegetable gemination temperatures.

Video – Vegetable Soil Temperatures

Comments

Leave a Reply

More From Gardening Calendar

How to Grow and Care for a Lantana Plant

Grow beautiful, low-maintenance lantana for your home or garden with the right materials and tips. Lantana plants are easy to start from seed and suitable for growing in containers indoors or outdoors. Learn how to start, repot, and care for lantanas today!

Canada Milk Vetch

Attract hummingbirds, birds, butterflies and bees with Canada Milk Vetch – a beautiful flower perfect for bouquets, heavy clay soils and winter flowerpots. Perfect for restoration gardens, erosion control and dry climates.

On Trees around Eastern Ontario

Discover the fascinating trees, plants and shrubs of eastern Ontario! Join Ottawa Field Naturalist Club's Owen Clarkin on a tour to Oak Valley, Merrickville, and Constance Bay – featuring a population of wild Swamp White Oaks, the world's largest Rock Elm, Red Spruce, and rare species like Butterfly Milkweed and Hairy Puccoon.