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🍂 First Frost Dates for Grantham, New Hampshire 03753

The first 36°F frost date is 30% likely to be on Sep 4. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 20. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Grantham, NH 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 24
20% chanceAug 31
30% chanceSep 4
40% chanceSep 7
50% chanceSep 10
60% chanceSep 13
70% chanceSep 17
80% chanceSep 20
90% chanceSep 25
Probability of light freeze (32°F) on or before...
10% chanceSep 9
20% chanceSep 16
30% chanceSep 20
40% chanceSep 23
50% chanceSep 25
60% chanceSep 28
70% chanceSep 30
80% chanceOct 2
90% chanceOct 5
Probability of moderate freeze (28°F) on or before...
10% chanceSep 24
20% chanceSep 28
30% chanceOct 1
40% chanceOct 2
50% chanceOct 4
60% chanceOct 6
70% chanceOct 8
80% chanceOct 11
90% chanceOct 15
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 2
20% chanceOct 6
30% chanceOct 9
40% chanceOct 11
50% chanceOct 14
60% chanceOct 16
70% chanceOct 18
80% chanceOct 22
90% chanceOct 28
Probability of hard freeze (20°F) on or before...
10% chanceOct 11
20% chanceOct 16
30% chanceOct 19
40% chanceOct 22
50% chanceOct 25
60% chanceOct 29
70% chanceNov 2
80% chanceNov 5
90% chanceNov 12
Probability of severe hard freeze (16°F) on or before...
10% chanceOct 22
20% chanceOct 28
30% chanceNov 1
40% chanceNov 5
50% chanceNov 9
60% chanceNov 14
70% chanceNov 18
80% chanceNov 22
90% chanceNov 27

Agricultural climatic data from weather station: NEWPORT (USC00275868)

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