Vancouver (WA) 49.5
This concludes your soil weather report. Conclusion for the weekend in western Washington: get digging!
Those soil temperatures listed above are courtesy of the handy-dandy AgWeatherNet maintained by Washington State University. The website shows many weather conditions, including soil temperatures, at stations around the state. Air temperature (with the minimum and
maximum for the last 24 hours), relative humidity, dew point and wind speed are also charted. Useful stuff.
But, chances are, these conditions are a bit different in your yard. That’s where a good weather station, or at
least a soil thermometer, will come in handy.
Current conditions in my urban Seattle garden: the soil temperature (in open ground) is 47.5. Under my plastic hoop-house cloche in a raised bed: 58.
Why is soil temperature so important? Because your vegetable seeds need particular minimum temperatures to germinate, and they need higher temperatures to germinate more quickly and vigorously.
Lettuce, beets, carrots and peas will all germinate in soil that’s in the low 40s.
Go ahead and plant. And wait, because it could take two to three weeks for the seedlings to break ground.
Pre-warm your gardren soil with a cloche or cold frame, and your seeds could jump out of the ground in half that time.