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Will it freeze in Riverton in the next 7 nights?
No overnight lows at or below 32°F are forecast in Riverton during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 38°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST.
1 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 38°F Above 36°F · Partly Cloudy
- Fri, Nov 6 35°F Frost possible · Mostly Clear
- Sat, Nov 7 39°F Above 36°F · Mostly Clear
- Sun, Nov 8 43°F Above 36°F · Mostly Clear
- Mon, Nov 9 44°F Above 36°F · Partly Cloudy
- Tue, Nov 10 42°F Above 36°F · Partly Cloudy
- Wed, Nov 11 44°F Above 36°F · Partly Cloudy
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Riverton
The median first fall hard-freeze date (28°F) is November 2, from NOAA’s 1991–2020 Climate Normals at Draper-Point Of Mountain. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Apr 17 · May 2 · May 22 | Sep 27 · Oct 10 · Oct 23 | 158 days |
| 32°F freeze | Mar 31 · Apr 18 · May 6 | Oct 7 · Oct 22 · Nov 5 | 185 days |
| 28°F hard freeze | Mar 7 · Mar 31 · Apr 17 | Oct 18 · Nov 2 · Nov 18 | 216 days |
Average high temperature by month
1991–2020 normals at Draper-Point Of Mountain
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Riverton, UT come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Draper-Point Of Mountain (station USC00422235, elevation 4,506 ft), 3.9 mi from Riverton. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Riverton
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| South Jordan, UT | 3.1 mi | Apr 18 | Oct 22 |
| Bluffdale, UT | 3.1 mi | Apr 18 | Oct 22 |
| Herriman, UT | 3.7 mi | Apr 18 | Oct 22 |
| Draper, UT | 5.6 mi | Apr 18 | Oct 22 |
| West Jordan, UT | 6.2 mi | Apr 18 | Oct 22 |
| White City, UT | 6.2 mi | Apr 29 | Oct 22 |
| Sandy, UT | 6.8 mi | Apr 29 | Oct 22 |
| Midvale, UT | 7.5 mi | Apr 29 | Oct 22 |
| Lehi, UT | 8.7 mi | Apr 30 | Oct 9 |
| Kearns, UT | 9.3 mi | Apr 8 | Oct 31 |
Frequently asked questions
When is the last frost in Riverton?
On average, the last spring frost (32°F) in Riverton is around April 18. In about 1 year in 10 it comes after May 6, and in 9 years in 10 it comes after March 31.
When is the first frost in Riverton?
The first fall frost (32°F) usually arrives around October 22. There’s a 10% chance of a freeze by October 7 and a 90% chance by November 5.
Can it frost in Riverton after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after May 2.
What growing zone is Riverton?
Riverton is in USDA Plant Hardiness Zone 7a (average annual extreme minimum temperature 0 to 5°F), based on the 2023 USDA map for ZIP code 84065. See growing zones in Utah.
More: all Utah frost dates · Utah growing zones · UV index today in Riverton · frost vs. freeze