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Will it freeze in Oak Harbor in the next 7 nights?
No overnight lows at or below 32°F are forecast in Oak Harbor during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 46°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 46°F Above 36°F · Light Rain
- Fri, Nov 6 49°F Above 36°F · Chance Light Rain
- Sat, Nov 7 48°F Above 36°F · Light Rain
- Sun, Nov 8 40°F Above 36°F · Partly Cloudy
- Mon, Nov 9 47°F Above 36°F · Light Rain
- Tue, Nov 10 50°F Above 36°F · Light Rain Likely
- Wed, Nov 11 48°F Above 36°F · Light Rain Likely
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 Oak Harbor
The median first fall hard-freeze date (28°F) is December 1, from NOAA’s 1991–2020 Climate Normals at Whidbey Island NAS. 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 | Mar 22 · Apr 9 · Apr 29 | Oct 6 · Oct 28 · Nov 17 | 200 days |
| 32°F freeze | Feb 20 · Mar 13 · Apr 1 | Oct 26 · Nov 14 · Dec 5 | 244 days |
| 28°F hard freeze | Jan 5 · Feb 18 · Mar 12 | Nov 9 · Dec 1 · Jan 6 | 290 days |
Average high temperature by month
1991–2020 normals at Whidbey Island NAS
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 Oak Harbor, WA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Whidbey Island NAS (station USW00024255, elevation 47 ft), 4.3 mi from Oak Harbor. 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 Oak Harbor
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Anacortes, WA | 14 mi | Mar 8 | Nov 20 |
| Stanwood, WA | 14 mi | Apr 22 | Oct 19 |
| Port Townsend, WA | 14 mi | Mar 1 | Nov 28 |
| Mount Vernon, WA | 17 mi | Mar 24 | Nov 3 |
| Burlington, WA | 18 mi | Mar 24 | Nov 3 |
| Sedro-Woolley, WA | 24 mi | Mar 27 | Nov 6 |
| Arlington, WA | 24 mi | Apr 22 | Oct 19 |
| Sequim, WA | 26 mi | Apr 21 | Oct 20 |
| Marysville, WA | 26 mi | Mar 24 | Nov 2 |
| Mukilteo, WA | 30 mi | Mar 9 | Nov 17 |
Frequently asked questions
When is the last frost in Oak Harbor?
On average, the last spring frost (32°F) in Oak Harbor is around March 13. In about 1 year in 10 it comes after April 1, and in 9 years in 10 it comes after February 20.
When is the first frost in Oak Harbor?
The first fall frost (32°F) usually arrives around November 14. There’s a 10% chance of a freeze by October 26 and a 90% chance by December 5.
Can it frost in Oak Harbor 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 9.
What growing zone is Oak Harbor?
Oak Harbor 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 98277. See growing zones in Washington.
More: all Washington frost dates · Washington growing zones · frost vs. freeze