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Will it freeze in Pasco in the next 7 nights?
No overnight lows at or below 32°F are forecast in Pasco during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 33°F. Frost possible.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
4 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 33°F Frost possible · Partly Cloudy
- Fri, Nov 6 36°F Frost possible · Mostly Cloudy
- Sat, Nov 7 39°F Above 36°F · Mostly Cloudy
- Sun, Nov 8 34°F Frost possible · Mostly Cloudy
- Mon, Nov 9 35°F Frost possible · Chance Rain Showers
- Tue, Nov 10 38°F Above 36°F · Chance Rain Showers
- Wed, Nov 11 39°F Above 36°F · 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 Pasco
The median first fall hard-freeze date (28°F) is October 23, from NOAA’s 1991–2020 Climate Normals at Pasco Tri Cities 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 | Apr 27 · May 9 · May 23 | Sep 15 · Sep 29 · Oct 13 | 143 days |
| 32°F freeze | Apr 8 · Apr 27 · May 10 | Sep 28 · Oct 11 · Oct 27 | 168 days |
| 28°F hard freeze | Mar 20 · Apr 7 · Apr 28 | Oct 6 · Oct 23 · Nov 8 | 197 days |
Average high temperature by month
1991–2020 normals at Pasco Tri Cities 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 Pasco, WA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Pasco Tri Cities Airport (station USW00024163, elevation 407 ft), 0.2 mi from Pasco. 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 Pasco
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Kennewick, WA | 5.6 mi | Mar 28 | Oct 30 |
| Richland, WA | 8.1 mi | Apr 6 | Oct 24 |
| West Richland, WA | 13 mi | Apr 6 | Oct 24 |
| Umatilla, OR | 26 mi | Mar 30 | Nov 4 |
| Connell, WA | 30 mi | Apr 30 | Oct 12 |
| Hermiston, OR | 31 mi | Apr 26 | Oct 10 |
| Prosser, WA | 31 mi | Apr 14 | Oct 22 |
| Grandview, WA | 38 mi | May 1 | Oct 6 |
| College Place, WA | 38 mi | May 2 | Oct 1 |
| Othello, WA | 39 mi | Apr 30 | Oct 12 |
Frequently asked questions
When is the last frost in Pasco?
On average, the last spring frost (32°F) in Pasco is around April 27. In about 1 year in 10 it comes after May 10, and in 9 years in 10 it comes after April 8.
When is the first frost in Pasco?
The first fall frost (32°F) usually arrives around October 11. There’s a 10% chance of a freeze by September 28 and a 90% chance by October 27.
Can it frost in Pasco 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 9.
What growing zone is Pasco?
Pasco 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 99336. See growing zones in Washington.
More: all Washington frost dates · Washington growing zones · UV index today in Pasco · frost vs. freeze