Frost Watch Card

Post near the phone. When temps drop, you don't want to think.

Last frost date (10% risk): First frost date (10% risk):

If tonight's low is forecast below 36F:

• ☐ Check station forecast + NOAA forecast
• ☐ Row cover all tender transplants
• ☐ Turn on frost sprinklers if installed
• ☐ Hauled out tender potted trees/herbs
• ☐ Water well in late afternoon (wet soil holds heat)
• ☐ Close greenhouse / tunnel vents at 4pm
• ☐ Start heater on propagation benches

If forecast below 30F:

• ☐ All of the above, plus:
• ☐ Double row cover critical crops
• ☐ Plastic over hoop supports
• ☐ Drain irrigation lines if below 28F risk
• ☐ Leave water running low at one tap (prevent pipe freeze)

Day-after frost:

• ☐ Observe damage before watering
• ☐ Do NOT uncover until air temp > 40F
• ☐ Hose off iced leaves before sun strikes
• ☐ Record event in Field Journal

Crop frost thresholds (PNW region - adjust for yours)

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