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🍂 2026 First Frost Dates for Grand Lake, Colorado 80447

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 🌷 Last Spring Frost Dates.)

First frost date probabilities for Grand Lake, CO 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% chance always
20% chance always
30% chance always
40% chance always
50% chance always
60% chance always
70% chance always
80% chance always
90% chance always
Probability of light freeze (32°F) on or before...
10% chance always
20% chance always
30% chance always
40% chance always
50% chance always
60% chance always
70% chance always
80% chance always
90% chance always
Probability of moderate freeze (28°F) on or before...
10% chance Aug 28
20% chance Sep 1
30% chance Sep 5
40% chance Sep 7
50% chance Sep 10
60% chance Sep 12
70% chance Sep 14
80% chance Sep 17
90% chance Sep 22
Probability of moderate hard freeze (24°F) on or before...
10% chance Sep 9
20% chance Sep 13
30% chance Sep 17
40% chance Sep 20
50% chance Sep 23
60% chance Sep 26
70% chance Sep 28
80% chance Oct 1
90% chance Oct 5
Probability of hard freeze (20°F) on or before...
10% chance Sep 23
20% chance Sep 26
30% chance Sep 30
40% chance Oct 2
50% chance Oct 4
60% chance Oct 7
70% chance Oct 10
80% chance Oct 13
90% chance Oct 18
Probability of severe hard freeze (16°F) on or before...
10% chance Oct 1
20% chance Oct 6
30% chance Oct 9
40% chance Oct 12
50% chance Oct 15
60% chance Oct 18
70% chance Oct 21
80% chance Oct 25
90% chance Oct 29

Agricultural climatic data from weather station: GRAND LAKE 1 NW (USC00053496:frost)

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