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🌷 Last Frost Dates for Yellowstone National Park, Wyoming 82190

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

A 32°F light freeze is always a risk here. (See detailed probabilities below.)

(See also 🍂 First Fall Frost Dates.)

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

Agricultural climatic data from weather station: LAKE YELLOWSTONE (USC00485345)

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