Last Spring Frost Dates

— dashed line = 50% probability (median) —

Probability Benchmarks

Location Comparison

Hartsville, SC
Median Frost
Mar 25
Season
224 days
Zone
8a
90% Safe
Apr 10
Highlands, NY
Median Frost
Apr 19
Season
183 days
Zone
6b
90% Safe
May 7
Highlands runs 25 days later to median last frost and has a 41-day shorter growing season — roughly two full USDA hardiness zones colder.