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Will it freeze in Sumner in the next 7 nights?
No overnight lows at or below 32°F are forecast in Sumner during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 43°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 43°F Above 36°F · Mostly Cloudy then Chance Light Rain
- Fri, Nov 6 48°F Above 36°F · Light Rain
- Sat, Nov 7 48°F Above 36°F · Light Rain
- Sun, Nov 8 39°F Above 36°F · Partly Cloudy
- Mon, Nov 9 47°F Above 36°F · Light Rain Likely
- Tue, Nov 10 50°F Above 36°F · Light Rain Likely
- Wed, Nov 11 47°F Above 36°F · Chance Light Rain
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 Sumner
The median first fall hard-freeze date (28°F) is November 14, from NOAA’s 1991–2020 Climate Normals at Mcmillin Rsvr. 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 17 · May 1 · May 17 | Sep 30 · Oct 12 · Oct 31 | 163 days |
| 32°F freeze | Mar 23 · Apr 11 · Apr 29 | Oct 13 · Oct 30 · Nov 17 | 202 days |
| 28°F hard freeze | Feb 19 · Mar 16 · Apr 8 | Oct 28 · Nov 14 · Dec 8 | 244 days |
Average high temperature by month
1991–2020 normals at Mcmillin Rsvr
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 Sumner, WA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Mcmillin Rsvr (station USC00455224, elevation 579 ft), 6.4 mi from Sumner. 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 Sumner
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Edgewood, WA | 2.5 mi | Mar 8 | Nov 14 |
| Pacific, WA | 2.5 mi | Mar 8 | Nov 14 |
| Bonney Lake, WA | 3.7 mi | Apr 11 | Oct 30 |
| Milton, WA | 4.3 mi | Mar 8 | Nov 14 |
| Puyallup, WA | 4.3 mi | Apr 11 | Oct 30 |
| Fife, WA | 5.6 mi | Mar 8 | Nov 14 |
| Auburn, WA | 5.6 mi | Mar 20 | Nov 10 |
| Federal Way, WA | 7.5 mi | Mar 8 | Nov 14 |
| Orting, WA | 9.3 mi | Apr 11 | Oct 30 |
| Tacoma, WA | 11 mi | Mar 8 | Nov 14 |
Frequently asked questions
When is the last frost in Sumner?
On average, the last spring frost (32°F) in Sumner is around April 11. In about 1 year in 10 it comes after April 29, and in 9 years in 10 it comes after March 23.
When is the first frost in Sumner?
The first fall frost (32°F) usually arrives around October 30. There’s a 10% chance of a freeze by October 13 and a 90% chance by November 17.
Can it frost in Sumner 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 1.
What growing zone is Sumner?
Sumner is in USDA Plant Hardiness Zone 8b (average annual extreme minimum temperature 15 to 20°F), based on the 2023 USDA map for ZIP code 98390. See growing zones in Washington.
More: all Washington frost dates · Washington growing zones · frost vs. freeze