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🍂 First Frost Dates for Deadwood, South Dakota 57732

The first 36°F frost date is 30% likely to be on Sep 6. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 15. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Deadwood, 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 First Frost Date?

The first fall frost signals the end of your local growing season. This date serves as an important deadline for gardeners and farmers. You'll need to complete harvesting before this point. Annuals and other tender plants will die back when frost hits, and perennial plants will enter their dormant phase for winter. Meanwhile, it's time to enjoy a cup of hot cocoa and a cozy sweater—and start planning your spring garden!

How to use the First Frost Date?

Watch your local weather forecasts in early fall to predict the first frost date. Harvest tender crops and protect vulnerable plants before frost arrives. For late-summer plantings, count backward from your area's average first frost date. This ensures your crops have enough time to mature. Keep track of when frost actually occurs in your garden each year. This helps you identify protected spots where the growing season might last longer.

First Frost Date Probabilities

Probability of frost (36°F) on or before...
10% chanceAug 28
20% chanceSep 2
30% chanceSep 6
40% chanceSep 9
50% chanceSep 12
60% chanceSep 15
70% chanceSep 17
80% chanceSep 20
90% chanceSep 24
Probability of light freeze (32°F) on or before...
10% chanceSep 5
20% chanceSep 11
30% chanceSep 15
40% chanceSep 18
50% chanceSep 21
60% chanceSep 23
70% chanceSep 26
80% chanceSep 29
90% chanceOct 3
Probability of moderate freeze (28°F) on or before...
10% chanceSep 13
20% chanceSep 18
30% chanceSep 22
40% chanceSep 25
50% chanceSep 29
60% chanceOct 1
70% chanceOct 4
80% chanceOct 7
90% chanceOct 12
Probability of moderate hard freeze (24°F) on or before...
10% chanceSep 21
20% chanceSep 26
30% chanceOct 1
40% chanceOct 4
50% chanceOct 7
60% chanceOct 11
70% chanceOct 15
80% chanceOct 19
90% chanceOct 24
Probability of hard freeze (20°F) on or before...
10% chanceOct 1
20% chanceOct 6
30% chanceOct 12
40% chanceOct 17
50% chanceOct 20
60% chanceOct 23
70% chanceOct 26
80% chanceOct 30
90% chanceNov 5
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 14
20% chanceOct 20
30% chanceOct 24
40% chanceOct 27
50% chanceOct 31
60% chanceNov 3
70% chanceNov 7
80% chanceNov 12
90% chanceNov 17

Agricultural climatic data from weather station: DEADWOOD (USC00392207)

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