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Will it freeze in La Grande in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 31°F (Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST).
Tonight: forecast low 31°F. Freeze.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
2 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 31°F Freeze · Mostly Clear
- Fri, Nov 6 38°F Above 36°F · Partly Cloudy
- Sat, Nov 7 41°F Above 36°F · Partly Cloudy then Slight Chance Rain Showers
- Sun, Nov 8 35°F Frost possible · Slight Chance Rain Showers then Mostly Cloudy
- Mon, Nov 9 38°F Above 36°F · Partly Cloudy then Slight Chance Rain Showers
- Tue, Nov 10 42°F Above 36°F · Slight Chance Rain Showers
- Wed, Nov 11 41°F Above 36°F · Slight Chance Rain Showers
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 La Grande
The median first fall hard-freeze date (28°F) is October 14, from NOAA’s 1991–2020 Climate Normals at La Grande. 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 7 · May 26 · Jun 14 | Sep 3 · Sep 19 · Oct 3 | 116 days |
| 32°F freeze | Apr 21 · May 6 · May 26 | Sep 17 · Oct 1 · Oct 16 | 146 days |
| 28°F hard freeze | Apr 1 · Apr 19 · May 5 | Sep 30 · Oct 14 · Oct 29 | 177 days |
Average high temperature by month
1991–2020 normals at La Grande
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 La Grande, OR come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: La Grande (station USC00354622, elevation 2,755 ft), 0.8 mi from La Grande. 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 La Grande
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Baker City, OR | 40 mi | May 25 | Sep 15 |
| Pendleton, OR | 43 mi | Apr 22 | Oct 9 |
| Milton-Freewater, OR | 45 mi | Mar 25 | Oct 29 |
| College Place, WA | 52 mi | May 2 | Oct 1 |
| Walla Walla, WA | 53 mi | Mar 27 | Oct 31 |
| Hermiston, OR | 68 mi | Apr 26 | Oct 10 |
| Umatilla, OR | 73 mi | Mar 30 | Nov 4 |
| Kennewick, WA | 80 mi | Mar 28 | Oct 30 |
| Pasco, WA | 82 mi | Apr 27 | Oct 11 |
| Richland, WA | 88 mi | Apr 6 | Oct 24 |
Frequently asked questions
When is the last frost in La Grande?
On average, the last spring frost (32°F) in La Grande is around May 6. In about 1 year in 10 it comes after May 26, and in 9 years in 10 it comes after April 21.
When is the first frost in La Grande?
The first fall frost (32°F) usually arrives around October 1. There’s a 10% chance of a freeze by September 17 and a 90% chance by October 16.
Can it frost in La Grande 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 26.
What growing zone is La Grande?
La Grande is in USDA Plant Hardiness Zone 6b (average annual extreme minimum temperature −5 to 0°F), based on the 2023 USDA map for ZIP code 97850. See growing zones in Oregon.
More: all Oregon frost dates · Oregon growing zones · frost vs. freeze