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Will it freeze in Smithfield in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 32°F (Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST).
Tonight: forecast low 32°F. Freeze.
NWS forecast period: Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST.
3 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 32°F Freeze · Partly Cloudy
- Fri, Nov 6 32°F Freeze · Mostly Clear
- Sat, Nov 7 35°F Frost possible · Mostly Clear
- Sun, Nov 8 38°F Above 36°F · Mostly Clear
- Mon, Nov 9 39°F Above 36°F · Partly Cloudy
- Tue, Nov 10 38°F Above 36°F · Partly Cloudy
- Wed, Nov 11 39°F Above 36°F · Mostly Clear
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 Smithfield
The median first fall hard-freeze date (28°F) is October 13, from NOAA’s 1991–2020 Climate Normals at Logan Cache Airport. 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 | May 10 · May 30 · Jun 17 | Sep 5 · Sep 20 · Oct 4 | 112 days |
| 32°F freeze | Apr 24 · May 8 · May 29 | Sep 19 · Oct 2 · Oct 15 | 144 days |
| 28°F hard freeze | Apr 4 · Apr 22 · May 6 | Sep 29 · Oct 13 · Oct 27 | 173 days |
Average high temperature by month
1991–2020 normals at Logan Cache Airport
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 Smithfield, UT come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Logan Cache Airport (station USW00094128, elevation 4,454 ft), 3.6 mi from Smithfield. 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 Smithfield
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Hyde Park, UT | 2.5 mi | May 8 | Oct 2 |
| North Logan, UT | 4.3 mi | Apr 30 | Oct 16 |
| Logan, UT | 6.8 mi | May 8 | Oct 2 |
| Providence, UT | 9.3 mi | Apr 30 | Oct 16 |
| Nibley, UT | 11 mi | May 12 | Sep 28 |
| Hyrum, UT | 14 mi | May 12 | Sep 28 |
| Preston, ID | 19 mi | May 16 | Sep 28 |
| Tremonton, UT | 21 mi | Apr 24 | Oct 17 |
| Brigham City, UT | 25 mi | May 5 | Oct 5 |
| Perry, UT | 28 mi | May 5 | Oct 5 |
Frequently asked questions
When is the last frost in Smithfield?
On average, the last spring frost (32°F) in Smithfield is around May 8. In about 1 year in 10 it comes after May 29, and in 9 years in 10 it comes after April 24.
When is the first frost in Smithfield?
The first fall frost (32°F) usually arrives around October 2. There’s a 10% chance of a freeze by September 19 and a 90% chance by October 15.
Can it frost in Smithfield 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 30.
What growing zone is Smithfield?
Smithfield is in USDA Plant Hardiness Zone 6a (average annual extreme minimum temperature −10 to −5°F), based on the 2023 USDA map for ZIP code 84318. See growing zones in Utah.
More: all Utah frost dates · Utah growing zones · frost vs. freeze