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🍂 First Frost Dates for Olney, Illinois 62450

The first 36°F frost date is 30% likely to be on Oct 1. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 10. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Olney, IL 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 22
20% chanceSep 28
30% chanceOct 1
40% chanceOct 4
50% chanceOct 6
60% chanceOct 9
70% chanceOct 13
80% chanceOct 17
90% chanceOct 22
Probability of light freeze (32°F) on or before...
10% chanceOct 1
20% chanceOct 6
30% chanceOct 10
40% chanceOct 14
50% chanceOct 17
60% chanceOct 21
70% chanceOct 24
80% chanceOct 28
90% chanceNov 1
Probability of moderate freeze (28°F) on or before...
10% chanceOct 10
20% chanceOct 17
30% chanceOct 21
40% chanceOct 25
50% chanceOct 28
60% chanceNov 1
70% chanceNov 3
80% chanceNov 6
90% chanceNov 12
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 19
20% chanceOct 26
30% chanceOct 31
40% chanceNov 3
50% chanceNov 7
60% chanceNov 11
70% chanceNov 15
80% chanceNov 19
90% chanceNov 26
Probability of hard freeze (20°F) on or before...
10% chanceOct 29
20% chanceNov 4
30% chanceNov 10
40% chanceNov 15
50% chanceNov 20
60% chanceNov 24
70% chanceNov 28
80% chanceDec 2
90% chanceDec 8
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 7
20% chanceNov 18
30% chanceNov 24
40% chanceNov 29
50% chanceDec 2
60% chanceDec 5
70% chanceDec 9
80% chanceDec 15
90% chanceDec 22

Agricultural climatic data from weather station: OLNEY 2S (USC00116446)

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