Look up the average last frost date for the area where you live. You should probably assume that the last frost will occur a little later than the average date, because you don't want your seeds to be ready too early.
Cool-season crops like broccoli and cabbage can be set out a week or two before the average last frost date.
Most planting and seed sowing instructions are based on the average last frost date, which is defined as "the last day in the spring that you might have a killing frost".
The dates to start your seeds indoors are dependent upon your average last frost date. Call your county extension agent or consult your state's University Extension website.
Judge Shattuck usually starts moving his plants out around April 15, although the average last frost date in Ohio is May 15. Plants come through light frosts with only a little burning of the leaves.
Plant the corms as early as a month before the average last frost date and every two weeks after that for continuous bloom. Glads are top-heavy; to reduce the amount of staking you'll have to do, plant the corms in a shallow trench.
Plan to set out home grown or purchased transplants after the last spring frost date.
Start plants indoors in flats or pots 8 to 10 weeks before the average last frost date.
Preparation ...
70-75F, and are best for spring or fall displays (or winter, in the Deep South). Popular cool-season annuals include pansy, viola, nemesia, diascia, osteospermum, and flowering kale. Plant cool-season annuals before your average last frost date.
 See also: Frost, Plant, Gardener, Planting, Flower
  
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