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Will it freeze in Ephrata in the next 7 nights?
No overnight lows at or below 32°F are forecast in Ephrata during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 37°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
3 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 37°F Above 36°F · Partly Cloudy then Patchy Fog
- Fri, Nov 6 36°F Frost possible · Slight Chance Light Rain then Mostly Cloudy
- Sat, Nov 7 39°F Above 36°F · Mostly Cloudy
- Sun, Nov 8 34°F Frost possible · Mostly Cloudy
- Mon, Nov 9 36°F Frost possible · Chance Light Rain
- Tue, Nov 10 40°F Above 36°F · Chance Light Rain
- Wed, Nov 11 41°F Above 36°F · Slight Chance Light Rain 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 Ephrata
The median first fall hard-freeze date (28°F) is October 27, from NOAA’s 1991–2020 Climate Normals at Ephrata Municipal 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 22 · May 4 · May 22 | Sep 22 · Oct 5 · Oct 17 | 153 days |
| 32°F freeze | Apr 8 · Apr 22 · May 6 | Oct 3 · Oct 17 · Oct 28 | 175 days |
| 28°F hard freeze | Mar 19 · Apr 6 · Apr 25 | Oct 14 · Oct 27 · Nov 10 | 202 days |
Average high temperature by month
1991–2020 normals at Ephrata Municipal 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 Ephrata, WA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Ephrata Municipal Airport (station USW00024141, elevation 1,252 ft), 0.9 mi from Ephrata. 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 Ephrata
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Quincy, WA | 16 mi | Apr 21 | Oct 16 |
| Moses Lake, WA | 17 mi | Apr 27 | Oct 8 |
| East Wenatchee, WA | 36 mi | Apr 4 | Oct 28 |
| Othello, WA | 38 mi | Apr 30 | Oct 12 |
| Wenatchee, WA | 38 mi | Apr 4 | Oct 28 |
| Ellensburg, WA | 52 mi | May 8 | Oct 2 |
| Connell, WA | 56 mi | Apr 30 | Oct 12 |
| Selah, WA | 66 mi | May 5 | Oct 4 |
| Yakima, WA | 69 mi | Apr 8 | Oct 23 |
| Union Gap, WA | 69 mi | May 8 | Oct 4 |
Frequently asked questions
When is the last frost in Ephrata?
On average, the last spring frost (32°F) in Ephrata is around April 22. In about 1 year in 10 it comes after May 6, and in 9 years in 10 it comes after April 8.
When is the first frost in Ephrata?
The first fall frost (32°F) usually arrives around October 17. There’s a 10% chance of a freeze by October 3 and a 90% chance by October 28.
Can it frost in Ephrata 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 4.
What growing zone is Ephrata?
Ephrata 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 98823. See growing zones in Washington.
More: all Washington frost dates · Washington growing zones · frost vs. freeze