Lake Bosworth, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Bosworth, a community in Snohomish County, Washington.
Tonight
50°F
Mostly Clear
Mostly clear, with a low around 50. Northwest wind around 2 mph.
7-day forecast for Lake Bosworth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 74°F | Mostly Sunny | 2 mph NW | 0% |
| Sunday Night | 50°F | Partly Cloudy | 1 mph NNW | 0% |
| Monday | 71°F | Partly Sunny | 2 mph WNW | 0% |
| Monday Night | 49°F | Partly Cloudy | 2 mph NNW | 0% |
| Tuesday | 68°F | Partly Sunny | 1 mph NNW | 1% |
| Tuesday Night | 48°F | Mostly Cloudy | 2 mph NE | 13% |
| Wednesday | 66°F | Slight Chance Light Rain | 2 mph SE | 15% |
| Wednesday Night | 46°F | Mostly Cloudy | 1 mph NE | 13% |
| Thursday | 64°F | Mostly Cloudy then Slight Chance Light Rain | 2 mph NNW | 20% |
| Thursday Night | 46°F | Slight Chance Light Rain | 2 mph WNW | 20% |
| Friday | 64°F | Slight Chance Light Rain | 2 mph WSW | 19% |
| Friday Night | 44°F | Slight Chance Light Rain | 2 mph ENE | 21% |
| Saturday | 66°F | Slight Chance Light Rain then Partly Sunny | 2 mph S | 17% |
Forecast source: National Weather Service (api.weather.gov) for Lake Bosworth (48.055, -121.982). Updated through the day.
Growing snapshot for Lake Bosworth
Last spring frost
Apr 17
First fall frost
Oct 23
Growing season
188 days
Hardiness zone
8b
More local growing data for Lake Bosworth: nearby ZIP 98290 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Alderwood Manor
Arlington
Arlington Heights
Bothell East
Bothell West
Brier
Bunk Foss
Canyon Creek
Cathcart
Cavalero
Chain Lake
Clearview
Darrington
Eastmont
Edmonds
Esperance
Everett
Fobes Hill
Gold Bar
Granite Falls
Hat Island
Kayak Point
Lake Cassidy
Lake Cavanaugh
Lake Goodwin
Lake Roesiger
Lake Stevens
Lake Stickney
Larch Way
Lochsloy
Climate data from the nearest NOAA station, Monroe, Wa (7.6 mi from Lake Bosworth). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.