Do I need to cover plants for frost? Pick your city
Frost watch: cover at 34°F, or 36°F on clear, calm nights; 28°F is a hard freeze. Pick a city for a live 7-day verdict from the National Weather Service forecast and the months that usually work there.
Alabama
Arizona
Arkansas
California
Colorado
Connecticut
District of Columbia
Florida
Georgia
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Nebraska
Nevada
New Mexico
Oklahoma
Oregon
Rhode Island
South Carolina
Virginia
Washington
Wisconsin
The rules Fairsky uses
- Cover tender plants when the overnight low is forecast at 34°F or colder.
- At 35–36°F, Fairsky still says cover when the night looks clear and calm (little cloud, wind 5 mph or less), because the ground can frost before the air hits 32°F. (Fairsky default)
- 32°F or colder is a freeze.
- 28°F or colder is a hard freeze, which kills most tender vegetation; bring pots inside, since covers may not be enough.
Your product's label wins.
Sources: NWS glossary: frost advisory · NWS glossary: hard freeze
The app covers 47 activities in all: see every activity and its rules.
Fairsky is not a substitute for official warnings. For warnings, go to weather.gov.
Live forecasts: National Weather Service / NOAA (public domain), fetched by your browser. Climate averages: NOAA NCEI U.S. Climate Normals, 1991–2020 (public domain). Activity thresholds: product data sheets, ACI and university extension guidance, linked on each page; your product’s label wins.