Here's the scoop!

Kind of vegetable	Weeks needed to grow transplants*	Seed planting depth	Optimum temperature for germination	Plant-growing temperatures
				Day	Night
	(weeks)	(inches)	(oF)	(oF)	(oF)
Cabbage, broccoli and cauliflower	5 to 7	1/4 to 1/2	85	60-70	50-60
Lettuce	4 to 6	1/4 to 1/2	75	60-70	50-60
Onions	8 to 10	1/2	75	60-70	45-55
Tomatoes	5 to 6	1/4 to 1/2	85	70-80	60-65
Peppers	7 to 8	1/4 to 1/2	85	70-80	60-70
Eggplant	7 to 8	1/4 to 1/2	85	70-80	65-70
Cucumber, squash, muskmelon and watermelon	2 to 3	3/4 to 1	85	70-90	60-70