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🍂 First Frost Dates for Rio Grande, Ohio 45674

The first 36°F frost date is 30% likely to be on Sep 28. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 5. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Rio Grande, OH 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% chanceSep 20
20% chanceSep 24
30% chanceSep 28
40% chanceSep 30
50% chanceOct 2
60% chanceOct 4
70% chanceOct 6
80% chanceOct 10
90% chanceOct 14
Probability of light freeze (32°F) on or before...
10% chanceSep 30
20% chanceOct 3
30% chanceOct 5
40% chanceOct 8
50% chanceOct 11
60% chanceOct 13
70% chanceOct 16
80% chanceOct 20
90% chanceOct 25
Probability of moderate freeze (28°F) on or before...
10% chanceOct 7
20% chanceOct 12
30% chanceOct 15
40% chanceOct 18
50% chanceOct 21
60% chanceOct 24
70% chanceOct 27
80% chanceOct 31
90% chanceNov 4
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 17
20% chanceOct 22
30% chanceOct 26
40% chanceOct 30
50% chanceNov 1
60% chanceNov 4
70% chanceNov 7
80% chanceNov 10
90% chanceNov 16
Probability of hard freeze (20°F) on or before...
10% chanceOct 29
20% chanceNov 2
30% chanceNov 6
40% chanceNov 10
50% chanceNov 13
60% chanceNov 16
70% chanceNov 20
80% chanceNov 25
90% chanceDec 1
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 10
20% chanceNov 15
30% chanceNov 19
40% chanceNov 24
50% chanceNov 28
60% chanceDec 1
70% chanceDec 5
80% chanceDec 11
90% chanceDec 19

Agricultural climatic data from weather station: WATERLOO (USC00338810)

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