🌷 Your Ultimate Garden Calendar!

🌷 Last Frost Dates for Bighorn, Montana 59010

A 36°F frost is always a risk here. (See detailed probabilities below.)

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

(See also 🍂 First Fall Frost Dates.)

Last frost date probabilities for Bighorn, MT 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% chancealways
20% chancealways
30% chancealways
40% chancealways
50% chancealways
60% chancealways
70% chancealways
80% chancealways
90% chancealways
Probability of light freeze (32°F) on or after…
10% chanceJun 19
20% chanceJun 10
30% chanceJun 5
40% chanceJun 2
50% chanceMay 29
60% chanceMay 26
70% chanceMay 22
80% chanceMay 19
90% chanceMay 14
Probability of moderate freeze (28°F) on or after…
10% chanceMay 31
20% chanceMay 25
30% chanceMay 20
40% chanceMay 17
50% chanceMay 15
60% chanceMay 12
70% chanceMay 9
80% chanceMay 5
90% chanceMay 1
Probability of moderate hard freeze (24°F) on or after…
10% chanceMay 16
20% chanceMay 11
30% chanceMay 7
40% chanceMay 4
50% chanceMay 2
60% chanceApr 30
70% chanceApr 27
80% chanceApr 23
90% chanceApr 18
Probability of hard freeze (20°F) on or after…
10% chanceMay 7
20% chanceMay 2
30% chanceApr 28
40% chanceApr 24
50% chanceApr 21
60% chanceApr 17
70% chanceApr 13
80% chanceApr 8
90% chanceApr 3
Probability of severe hard freeze (16°F) on or after…
10% chanceApr 30
20% chanceApr 23
30% chanceApr 18
40% chanceApr 13
50% chanceApr 8
60% chanceApr 4
70% chanceApr 1
80% chanceMar 27
90% chanceMar 19

Agricultural climatic data from weather station: HYSHAM 25 SSE (USC00244364)

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