Soil Temperature in Sammamish, WA

Real-time soil temperature data at multiple depths for agricultural and gardening use.

As of now, the soil temperature at a depth of 6 inches is 48.5°F, at 12 inches is 45°F, and deeper at 20 inches it's 41.6°F. Based on the 6-inch reading, planting conditions are currently: Too Cold for Planting

Current Soil Temperature Readings by Inch Depth

  • 2" depth 49.3°F
  • 4" depth 49.3°F
  • 6" depth 48.5°F
  • 8" depth 47°F
  • 12" depth 45°F
  • 20" depth 41.6°F

Soil Temperature Planting Readiness

Too Cold for Planting

Pre-Emergent Herbicide Application (Spring - Crabgrass/Summer Weeds)

Ready to Apply

Soil has been at 50°F+ for 7 consecutive days. Pre-emergent can be applied now.

7/3 days
Temperature Progress

Today's Highest Soil Temp (6"): 56.7°F

Required: 50°F+

Last updated: Apr 23, 2026

Application Guidelines
  • Apply when soil reaches 50°F+ for 3+ consecutive days
  • Typically applied in February or March
  • Controls summer annual weeds before they germinate
  • Water lightly after application for best results