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Will it freeze in West Richland in the next 7 nights?
No overnight lows at or below 32°F are forecast in West Richland during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 35°F. Frost possible.
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 35°F Frost possible · Partly Cloudy then Patchy Fog
- Fri, Nov 6 39°F Above 36°F · Slight Chance Rain Showers then Mostly Cloudy
- Sat, Nov 7 41°F Above 36°F · Mostly Cloudy
- Sun, Nov 8 36°F Frost possible · Mostly Cloudy
- Mon, Nov 9 38°F Above 36°F · 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 then Mostly 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 West Richland
The median first fall hard-freeze date (28°F) is November 4, from NOAA’s 1991–2020 Climate Normals at Richland. 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 11 · Apr 25 · May 8 | Sep 30 · Oct 14 · Oct 27 | 171 days |
| 32°F freeze | Mar 22 · Apr 6 · Apr 24 | Oct 10 · Oct 24 · Nov 8 | 200 days |
| 28°F hard freeze | Mar 1 · Mar 18 · Apr 5 | Oct 20 · Nov 4 · Nov 23 | 229 days |
Average high temperature by month
1991–2020 normals at Richland
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 West Richland, WA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Richland (station USC00457015, elevation 373 ft), 6.0 mi from West Richland. 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 West Richland
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Richland, WA | 5.0 mi | Apr 6 | Oct 24 |
| Kennewick, WA | 13 mi | Mar 28 | Oct 30 |
| Pasco, WA | 13 mi | Apr 27 | Oct 11 |
| Prosser, WA | 19 mi | Apr 14 | Oct 22 |
| Grandview, WA | 25 mi | May 1 | Oct 6 |
| Umatilla, OR | 27 mi | Mar 30 | Nov 4 |
| Sunnyside, WA | 29 mi | May 1 | Oct 6 |
| Hermiston, OR | 34 mi | Apr 26 | Oct 10 |
| Connell, WA | 35 mi | Apr 30 | Oct 12 |
| Othello, WA | 37 mi | Apr 30 | Oct 12 |
Frequently asked questions
When is the last frost in West Richland?
On average, the last spring frost (32°F) in West Richland is around April 6. In about 1 year in 10 it comes after April 24, and in 9 years in 10 it comes after March 22.
When is the first frost in West Richland?
The first fall frost (32°F) usually arrives around October 24. There’s a 10% chance of a freeze by October 10 and a 90% chance by November 8.
Can it frost in West Richland 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 April 25.
What growing zone is West Richland?
West Richland is in USDA Plant Hardiness Zone 7b (average annual extreme minimum temperature 5 to 10°F), based on the 2023 USDA map for ZIP code 99353. See growing zones in Washington.
More: all Washington frost dates · Washington growing zones · frost vs. freeze