Free NOAA frost lookup by ZIP Code
Last & First Frost Dates by ZIP Code
Enter a U.S. ZIP Code for average last spring and first fall frost dates, three NOAA-based freeze-risk levels, and the nearby station behind the estimates.
No account needed. Your ZIP Code is used to find nearby NOAA climate records and is not saved in a user database.
Read your frost window
Find your last frost date by ZIP Code—and your first fall frost
The lookup above matches your ZIP-area center to the nearest qualified NOAA station. It returns both spring and fall dates, so one search answers both frost-date questions.
Last spring frost
The estimated final spring night at or below 32°F. Use it as one checkpoint before moving frost-sensitive plants outdoors; warm-season crops may also need warm soil and nights.
First fall frost
The estimated first fall night at or below 32°F. It helps you judge how much season remains, but it is not a forecast for a particular year.
Gardeners and weather sources use “frost date” and “freeze date” differently. This calculator uses the same clear planning threshold for both dates: air temperature at or below 32°F.
For this year: these are historical climate probabilities, not a forecast. Check your local forecast before planting or harvesting.
Choose a risk level that fits your garden
The middle estimate represents a 50% historical risk level. The more cautious spring date is later, while the more cautious fall date is earlier, leaving extra room for a late spring or early fall freeze.
Why your garden may differ
A nearby weather station cannot capture every hill, low spot, city heat island or sheltered yard. Treat the dates as a starting point, then check the current forecast and conditions in your own garden.
Frost date vs. freeze date
A meteorological freeze is based on air temperature, while frost can form on exposed surfaces under different conditions. To make ZIP-code comparisons consistent, this tool reports NOAA's 32°F freeze probabilities and labels them as spring and fall frost-planning dates.
Turn a frost estimate into a planting plan
A frost date is only the first checkpoint. After you choose a suitable outdoor planting date, count backward for crops that need an indoor head start.
Where the estimates come from
The calculator uses NOAA's 1991-2020 records for days when the air temperature reached 32°F or lower. It finds a nearby station with enough complete years to support all three planning levels.
View technical matching details
- The source is NOAA 1991-2020 U.S. Climate Normals v1.0.1, using the 32°F agricultural probability fields.
- A station must provide all six spring and fall dates, NOAA S completeness and at least 24 years of observations.
- A ZIP Code is approximated by its 2025 Census ZCTA center, then matched to the closest station by straight-line distance over the earth.
- The tool returns no result when the closest eligible station is more than 100 miles away.
Read the complete NOAA and ZIP matching method →
Sources: 1991-2020 U.S. Climate Normals and 2025 Gazetteer ZCTA National File. NOAA normals edition: 1991-2020; ZIP-area mapping: 2025 Census ZCTA.