Marietta-Alderwood, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marietta-Alderwood, a community in Whatcom County, Washington.
Overnight
52°F
Mostly Cloudy
Mostly cloudy, with a low around 52. South southeast wind around 2 mph.
7-day forecast for Marietta-Alderwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Mostly Cloudy | 2 mph SSE | 0% |
| Saturday | 68°F | Partly Sunny | 3 mph S | 0% |
| Saturday Night | 50°F | Partly Cloudy | 1 mph SSE | 0% |
| Sunday | 69°F | Partly Sunny | 0 to 3 mph S | 0% |
| Sunday Night | 51°F | Partly Cloudy | 2 mph SSW | 0% |
| Monday | 68°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Monday Night | 51°F | Partly Cloudy | 0 to 3 mph S | 0% |
| Tuesday | 66°F | Partly Sunny | 0 to 5 mph S | 0% |
| Tuesday Night | 51°F | Mostly Cloudy | 7 mph S | 10% |
| Wednesday | 66°F | Partly Sunny | 3 to 7 mph SSW | 11% |
| Wednesday Night | 51°F | Mostly Cloudy | 0 to 3 mph SSE | 11% |
| Thursday | 65°F | Partly Sunny | 1 to 6 mph ENE | 13% |
| Thursday Night | 50°F | Slight Chance Light Rain | 0 to 5 mph SW | 20% |
| Friday | 65°F | Slight Chance Light Rain then Mostly Sunny | 1 to 6 mph W | 20% |
Forecast source: National Weather Service (api.weather.gov) for Marietta-Alderwood (48.788, -122.555). Updated through the day.
Growing snapshot for Marietta-Alderwood
Last spring frost
Apr 1
First fall frost
Nov 2
Growing season
216 days
Hardiness zone
8b
More local growing data for Marietta-Alderwood: nearby ZIP 98225 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Acme
Bellingham
Birch Bay
Blaine
Custer
Deming
Everson
Ferndale
Geneva
Glacier
Kendall
Lynden
Maple Falls
Nooksack
Peaceful Valley
Point Roberts
Sudden Valley
Sumas
Climate data from the nearest NOAA station, Bellingham 3 Ssw, Wa (2.8 mi from Marietta-Alderwood). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.