Optimum Vegetable Seed Germination Temperatures

Optimum Vegetable Seed Germination Temperatures

Here’s our handy work-in-progress list of what are currently thought to be the best temperatures for germinating vegetable seeds. Gleaned from various research papers, authoritative guides and experience, both Celsius and Fahrenheit temperatures are listed. We’ll be expanding this resource as time allows.


Optimal Temperatures for Vegetable Germination

VegetableMin. Temp.Ideal Temp.Max. Temp.
Asparagus10ºC / 50ºF24-29.5ºC / 75-85ºF35ºC / 95ºF
Aubergine15.5ºC / 60ºF24-29.5ºC / 75-85ºF35ºC / 95ºF
Beans (Lima)15.5ºC / 60ºF24-29.5ºC / 75-85ºF26.5ºC / 80ºF
Beans (Snap)15.5ºC / 60ºF24-29.5ºC / 75-85ºF 35ºC / 95ºF
Beets4.5ºC / 40ºF18-29.5ºC / 65-85ºF35ºC / 95ºF
Broccoli4.5ºC / 40ºF15.5-35ºC / 60-95ºF35ºC / 95ºF
Brussel Sprouts4.5ºC / 40ºF15.5-29.5ºC / 60-85ºF35ºC / 95ºF
Cabbage4.5ºC / 40ºF15.5-35ºC / 60-95ºF35ºC / 95ºF
Cantaloupe15.5ºC / 60ºF24-29.5ºC / 75-85ºF40.5ºC / 105ºF
Carrots4.5ºC / 40ºF15.5-35ºC / 60-95ºF35ºC / 95ºF
Cauliflower4.5ºC / 40ºF15.5-35ºC / 60-95ºF35ºC / 95ºF
Celery4.5ºC / 40ºF15.5-21ºC / 60-70ºF35ºC / 95ºF
Chard4.5ºC / 40ºF15.5-35ºC / 60-95ºF35ºC / 95ºF
Chinese Cabbage4.5ºC / 40ºF15.5-29.5ºC / 60-85ºF 35ºC / 95ºF
Collards4.5ºC / 40ºF15.5-29.5ºC / 60-85ºF 35ºC / 95ºF
Corn10ºC / 50ºF18-35ºC / 65-95ºF40.5ºC / 105ºF
Cucumber15.5ºC / 60ºF18-35ºC / 65-95ºF 35ºC / 95ºF
Endive1.5ºC / 35ºF15.5-24ºC / 60-75ºF29.5ºC / 85ºF
Garlic0ºC / 32ºF18-29.5ºC / 65-85ºF35ºC / 95ºF
Leek0ºC / 32ºF18-29.5ºC / 65-85ºF35ºC / 95ºF
Lettuce0ºC / 32ºF15.5-24ºC / 60-75ºF 29.5ºC / 85ºF
Kale4.5ºC / 40ºF15.5-29.5ºC / 60-85ºF 35ºC / 95ºF
Kohlrabi4.5ºC / 40ºF15.5-35ºC / 60-95ºF40.5ºC / 105ºF
Mustard1.5ºC / 35ºF15.5-24ºC / 60-75ºF 29.5ºC / 85ºF
Okra15.5ºC / 60ºF29.5-35ºC / 85-95ºF 40.5ºC / 105ºF
Onion0ºC / 32ºF18-29.5ºC / 65-85ºF35ºC / 95ºF
Parsley4.5ºC / 40ºF18-29.5ºC / 65-85ºF35ºC / 95ºF
Parsnip0ºC / 32ºF18-24ºC / 65-75ºF29.5ºC / 85ºF
Peas4.5ºC / 40ºF18-24ºC / 65-75ºF29.5ºC / 85ºF
Peppers15.5ºC / 60ºF18-24ºC / 65-75ºF35ºC / 95ºF
Pumpkins15.5ºC / 60ºF29.5-35ºC / 85-95ºF 40.5ºC / 105ºF
Radicchio1.5ºC / 35ºF15.5-24ºC / 60-75ºF29.5ºC / 85ºF
Radishes4.5ºC / 40ºF18-29.5ºC / 65-85ºF35ºC / 95ºF
Spinach0ºC / 32ºF18-24ºC / 65-75ºF24ºC / 75ºF
Squash15.5ºC / 60ºF29.5-35ºC / 85-95ºF 40.5ºC / 105ºF
Swiss Chard4.5ºC / 40ºF18-29.5ºC / 65-85ºF35ºC / 95ºF
Tomatoes10ºC / 50ºF18-29.5ºC / 65-85ºF35ºC / 95ºF
Turnips4.5ºC / 40ºF15.5-35ºC / 60-95ºF40.5ºC / 105ºF
Watermelons15.5ºC / 60ºF24-35ºC / 75-95ºF40.5ºC / 105ºF

We stock a small but perfectly formed selection of fruit and vegetable seed