A plant that requires warm soil (60°F+) and air temperatures, thrives in heat, and is killed by frost (tomatoes, peppers, squash, basil, beans).
In plain terms
Warm-season crops can't handle cold. Plant them after the last frost date when soil is warm (60°F+). They thrive in warm weather (70-85°F), produce poorly in cool weather, and die at first frost. Examples: tomatoes, peppers, squash, cucumbers, basil, beans. They're worth the wait—once established, they're productive through summer.
Why this matters
Understanding warm-season crop timing prevents wasted seeds or frost loss. Planting too early kills seedlings; late planting reduces season length.
In practice
Examples
Tomato planted too early (before last frost); soil 50°F; seeds rot; replant after last frost date.
Same tomato planted on schedule (last frost +2 weeks); soil 65°F+; thrives, productive all summer.
Basil planted outdoors in cool spring; struggles; wait until soil is warm and plant booms.
Warm-season crop in peak summer: grows vigorously; productive through season.
Practical applications
Count backward from last frost date; most warm-season crops need 6-8 weeks to mature.
Plant after last frost date; don't rush.
Soil temperature matters more than air temperature; wait for warm soil.
End-of-season: frost date approaches; stop planting; focus on harvest.
Season-extension methods (row covers, cold frames) protect from early frost.