🍂 2026 First Frost Dates for Riverton, Utah 84065
The first 36°F frost date is 30% likely to be on Oct 4. (See detailed probabilities below.)
The first 32°F light freeze date is 30% likely to be on Oct 16. (See detailed probabilities below.)
(See also 🌷 Last Spring Frost Dates.)
First frost date probabilities for Riverton, UT 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 | Sep 27 |
| 20% chance | Oct 1 |
| 30% chance | Oct 4 |
| 40% chance | Oct 7 |
| 50% chance | Oct 10 |
| 60% chance | Oct 13 |
| 70% chance | Oct 16 |
| 80% chance | Oct 19 |
| 90% chance | Oct 23 |
| Probability of light freeze (32°F) on or before... | |
|---|---|
| 10% chance | Oct 7 |
| 20% chance | Oct 12 |
| 30% chance | Oct 16 |
| 40% chance | Oct 19 |
| 50% chance | Oct 22 |
| 60% chance | Oct 24 |
| 70% chance | Oct 27 |
| 80% chance | Nov 1 |
| 90% chance | Nov 5 |
| Probability of moderate freeze (28°F) on or before... | |
|---|---|
| 10% chance | Oct 18 |
| 20% chance | Oct 22 |
| 30% chance | Oct 26 |
| 40% chance | Oct 29 |
| 50% chance | Nov 2 |
| 60% chance | Nov 5 |
| 70% chance | Nov 9 |
| 80% chance | Nov 13 |
| 90% chance | Nov 18 |
| Probability of moderate hard freeze (24°F) on or before... | |
|---|---|
| 10% chance | Oct 26 |
| 20% chance | Nov 1 |
| 30% chance | Nov 6 |
| 40% chance | Nov 10 |
| 50% chance | Nov 13 |
| 60% chance | Nov 16 |
| 70% chance | Nov 20 |
| 80% chance | Nov 25 |
| 90% chance | Dec 1 |
| Probability of hard freeze (20°F) on or before... | |
|---|---|
| 10% chance | Nov 6 |
| 20% chance | Nov 12 |
| 30% chance | Nov 16 |
| 40% chance | Nov 20 |
| 50% chance | Nov 24 |
| 60% chance | Nov 27 |
| 70% chance | Dec 1 |
| 80% chance | Dec 5 |
| 90% chance | Dec 12 |
| Probability of severe hard freeze (16°F) on or before... | |
|---|---|
| 10% chance | Nov 14 |
| 20% chance | Nov 20 |
| 30% chance | Nov 26 |
| 40% chance | Nov 30 |
| 50% chance | Dec 4 |
| 60% chance | Dec 8 |
| 70% chance | Dec 14 |
| 80% chance | Dec 20 |
| 90% chance | Dec 29 |
Agricultural climatic data from weather station: DRAPER-POINT OF MTN (USC00422235:frost)