Mossyrock, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mossyrock, a city in Lewis County, Washington.
Tonight
48°F
Mostly Cloudy
Mostly cloudy. Low around 48, with temperatures rising to around 50 overnight. Wind around 0 mph.
7-day forecast for Mossyrock
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Mostly Cloudy | 0 mph | 0% |
| Saturday | 75°F | Partly Sunny | 1 mph NW | 0% |
| Saturday Night | 49°F | Partly Cloudy | 1 mph N | 0% |
| Sunday | 77°F | Mostly Sunny | 2 mph NW | 0% |
| Sunday Night | 50°F | Mostly Clear | 1 mph NNW | 0% |
| Monday | 72°F | Mostly Sunny | 2 mph NW | 0% |
| Monday Night | 49°F | Partly Cloudy | 2 mph NNW | 0% |
| Tuesday | 68°F | Partly Sunny | 2 mph NW | 1% |
| Tuesday Night | 46°F | Partly Cloudy | 2 mph NNW | 1% |
| Wednesday | 68°F | Mostly Sunny | 1 mph N | 1% |
| Wednesday Night | 48°F | Partly Cloudy | 1 mph NE | 4% |
| Thursday | 72°F | Partly Sunny | 1 mph N | 13% |
| Thursday Night | 50°F | Chance Light Rain | 1 mph ESE | 26% |
| Friday | 65°F | Slight Chance Light Rain | 2 mph SW | 24% |
Forecast source: National Weather Service (api.weather.gov) for Mossyrock (46.530, -122.489). Updated through the day.
Growing snapshot for Mossyrock
Last spring frost
Apr 7
First fall frost
Nov 13
Growing season
215 days
Hardiness zone
8b
More local growing data for Mossyrock: nearby ZIP 98585 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Ashford
Centralia
Chehalis
Fords Prairie
Grand Mound
Morton
Napavine
Onalaska
Packwood
Pe Ell
Toledo
Vader
Winlock
Climate data from the nearest NOAA station, Mayfield Pwr Plt, Wa (8.6 mi from Mossyrock). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.