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🌷 Last Frost Dates for Fort Thompson, South Dakota 57339

The last 36°F Spring frost date is 30% likely to be on May 17. (See detailed probabilities below.)

The last 32°F light freeze date is 30% likely to be on May 7. (See detailed probabilities below.)

(See also 🍂 First Fall Frost Dates.)

Last frost date probabilities for Fort Thompson, SD are based on historical climate data.

Always check your local forecast for the most up-to-date frost warnings.

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What is a Last Frost Date?

The last spring frost signals when your area is safe from freezing temperatures. Tender plants can now grow outdoors without cold damage! This marks the beginning of the growing season. Last spring frost serves as your essential starting point for planting warm-season crops. It's also time to remove winter protection from your perennials. Enjoy the longer days and warmer weather!

How to use the Last Frost Date?

Start seeds indoors several weeks before your last frost date. This gives plants time to reach transplanting size when weather permits. Plan your outdoor planting schedule around your area's average last frost date. Plant some crops before and some after this date to protect against weather changes. Look for spots in your yard where frost stays longer or disappears earlier. Create your own frost map to use all available growing space and extend your season. Keep watching your local weather forecast to catch any surprise late frosts.

Last Frost Date Probabilities

Probability of frost (36°F) on or after…
10% chanceMay 27
20% chanceMay 22
30% chanceMay 17
40% chanceMay 14
50% chanceMay 12
60% chanceMay 9
70% chanceMay 6
80% chanceMay 3
90% chanceApr 30
Probability of light freeze (32°F) on or after…
10% chanceMay 16
20% chanceMay 11
30% chanceMay 7
40% chanceMay 4
50% chanceMay 2
60% chanceApr 30
70% chanceApr 28
80% chanceApr 25
90% chanceApr 20
Probability of moderate freeze (28°F) on or after…
10% chanceMay 6
20% chanceMay 2
30% chanceApr 30
40% chanceApr 27
50% chanceApr 24
60% chanceApr 21
70% chanceApr 18
80% chanceApr 15
90% chanceApr 11
Probability of moderate hard freeze (24°F) on or after…
10% chanceApr 28
20% chanceApr 23
30% chanceApr 20
40% chanceApr 17
50% chanceApr 14
60% chanceApr 11
70% chanceApr 9
80% chanceApr 6
90% chanceApr 2
Probability of hard freeze (20°F) on or after…
10% chanceApr 19
20% chanceApr 14
30% chanceApr 11
40% chanceApr 8
50% chanceApr 5
60% chanceApr 3
70% chanceMar 31
80% chanceMar 28
90% chanceMar 21
Probability of severe hard freeze (16°F) on or after…
10% chanceApr 11
20% chanceApr 6
30% chanceApr 3
40% chanceMar 31
50% chanceMar 28
60% chanceMar 24
70% chanceMar 21
80% chanceMar 16
90% chanceMar 12

Agricultural climatic data from weather station: LAKE SHARPE PROJECT (USC00394766)

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