Seattle in March: what to plant
Averaged over the last 5 years of daily records, March in Seattle runs 4.4–11.0°C with about 121 mm of rain across the month. Here is what that climate actually supports.
❄️ In 3 of the last 5 years, Seattle saw at least one night at or below 0°C in March (record low -1.9°C). Cold-sensitive crops need cover.
Best crops to sow now
- 🌱 Microgreens Fastest about 8 days to harvest 🪴 Windowsill pot — sheltered from outdoor weather
- 🍃 Mint about 30 days to harvest 🪴 Windowsill pot — sheltered from outdoor weather
- 🧅 Chives about 32 days to harvest 🪴 Windowsill pot — sheltered from outdoor weather
- 🌿 Basil about 34 days to harvest 🪴 Windowsill pot — sheltered from outdoor weather
- 🌿 Spinach 97 about 118 days to harvest Recent mean 7.7°C — right in the sweet spot
- 🍒 Cherry Radish 96 about 113 days to harvest Recent mean 7.7°C is too cold (ideal 8–25°C)
- 🧄 Garlic 84 about 150 days to harvest Recent mean 7.7°C — right in the sweet spot
- 🥬 Kale 78 about 164 days to harvest Recent mean 7.7°C — right in the sweet spot
Leave these for another month
- 🌻 Sunflower — Recent mean 7.7°C is too cold (ideal 14–30°C)
- 🎃 Pumpkin — Recent mean 7.7°C is too cold (ideal 16–30°C)
- 🌽 Sweet Corn — Recent mean 7.7°C is too cold (ideal 16–32°C)
Other months in Seattle
Temperature and rainfall are 5-year daily normals from the ERA5 reanalysis via Open-Meteo. Suitability is scored with the same degree-day model the game runs on — it is not a generic planting calendar.