Tracy's Sharebook 

From: svgardenclub.org
 When to Start Seeds Indoors: To determine the best time to start seeds indoors, first find the date that you expect to experience the last spring frost in your area. In our High desert elevations, from 3500-6000, this can range from late March to mid-May. To get more specific information contact the Cochise County Extension Office. Then count backward from that date to the number of weeks indicated below to determine when to start your seeds indoors:
12-14 weeks: onions, leeks, chives, pansies, impatiens, and coleus.
8-12 weeks: peppers, lettuce, cole crops (brassicas), petunias, snapdragons, alyssum and other hardy annuals.
6-8 weeks: eggplant and tomatoes.
5-6 weeks: zinnias, cockscombs, marigolds and other tender annuals.
2-4 weeks: cucumbers, melons, okra, pumpkins, squash. You may plan to grow your onions from purchased sets or plants, but if you’d like more options in the varieties you grow, consider starting them from seed.