Waterloo, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a town in Linn County, Oregon.
Overnight
55°F
Smoke
Smoke. Clear, with a low around 55. West southwest wind around 1 mph.
7-day forecast for Waterloo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Smoke | 1 mph WSW | 0% |
| Tuesday | 95°F | Smoke | 1 to 10 mph NNW | 0% |
| Tuesday Night | 61°F | Areas Of Smoke | 1 to 9 mph WNW | 0% |
| Wednesday | 97°F | Areas Of Smoke | 1 to 6 mph NW | 0% |
| Wednesday Night | 62°F | Clear | 1 to 6 mph N | 0% |
| Thursday | 97°F | Sunny | 0 to 7 mph NNW | 0% |
| Thursday Night | 58°F | Clear | 0 to 7 mph NW | 0% |
| Friday | 92°F | Sunny | 0 to 9 mph NNW | 0% |
| Friday Night | 59°F | Clear | 1 to 9 mph N | 0% |
| Saturday | 89°F | Sunny | 1 to 10 mph N | 0% |
| Saturday Night | 55°F | Mostly Clear | 2 to 10 mph NNW | 0% |
| Sunday | 83°F | Sunny | 2 to 10 mph NNW | 0% |
| Sunday Night | 53°F | Mostly Clear | 1 to 12 mph NNW | 0% |
| Monday | 82°F | Sunny | 1 to 9 mph NNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Waterloo (44.495, -122.824). Updated through the day.
Growing snapshot for Waterloo
Last spring frost
Mar 14
First fall frost
Nov 18
Growing season
248 days
Hardiness zone
8b
More local growing data for Waterloo: nearby ZIP 97355 weather · frost dates · planting calendar · Oregon frost dates
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Climate data from the nearest NOAA station, Lebanon, Or (4 mi from Waterloo). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.