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Germination and Soil Temperature

Crop

Minimum °F

Optimum Range °F

Optimum °F

Maximum °F

Bean

60

60-85

85

95

Beet

40

50-85

85

95

Cabbage

40

45-95

85

100

Carrot

40

45-85

80

95

Cauliflower

40

45-85

80

100

Celery

40

60-70

70*

85*

Swiss chard

40

50-85

85

95

Corn

50

60-95

95

105

Cucumber

60

60-95

95

105

Eggplant

60

75-90

85

95

Lettuce

35

40-80

75

85

Muskmelon

60

75-95

90

100

Onion

35

50-95

75

95

Parsley

40

50-85

75

90

Pea

40

40-75

75

85

Pepper

60

65-95

85

95

Pumpkin

60

70-90

95

100

Radish

40

45-90

85

95

Spinach

35

45-75

70

85

Squash

60

70-95

95

100

Tomato

50

60-85

85

95

Watermelon

60

70-95

95

105

* Daily fluctuation to 60° or lower at night is essential