USDA Hardiness Zone
Last Spring Frost
Average, 50% of years
First Fall Frost
Average, 50% of years
Growing Season
Frost-free days
Your planting calendar
When to start, transplant, and sow each vegetable, timed to your frost dates.
| Vegetable | What to do & when |
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Planting dates are computed as standard week-offsets from your average frost dates. Advisory, adjust for your microclimate, the current season, and each variety's days-to-maturity.
Need the whole dataset?
Building an app, a store locator, or a bulk mail campaign? Get the US Frost Dates & Planting Zones Dataset: 40,502 US ZIP codes with the 2023 USDA hardiness zone, average frost dates at 28°F, 32°F and 36°F, and growing-season length. Clean CSV and JSON, plus a planting-offset table for 27 vegetables and a 60-row sample. The README lists the coverage honestly, low-confidence ZIPs included.
Get the dataset for $19 →One payment of $19 USD, no account. The download link appears the moment the card clears. Thirty-day refund, no reason needed, the refund and cancellation policy is the binding version. See what is in it.
Or wire it into your own product with the free Frost Dates API.
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Popular lookups
Frost dates & planting, quick answers
What is a "last frost date"?
It's the average date of the last spring night that drops to 32°F (freezing) at your nearest weather station, based on NOAA's 1991–2020 climate normals. On the date shown, there's a 50% chance the last frost has already passed, so roughly half of years still see a frost after it. Wait 1–2 weeks past it before setting out tender crops like tomatoes if you want to play it safe.
What is a USDA plant hardiness zone?
The USDA zone is based on the average annual coldest temperature at your location. It tells you which perennials, shrubs, and trees can survive your winter. This tool uses the 2023 USDA Plant Hardiness Zone Map.
What's the difference between 28°F, 32°F, and 36°F frost?
32°F is a "light freeze" that kills tender plants. 28°F is a "hard freeze" that damages most vegetation. 36°F can bring a patchy "light frost" in low spots even when the official temperature stays above freezing. The dataset behind this tool includes all three thresholds.
How accurate is this for my exact yard?
Frost dates come from the nearest NOAA station with published freeze normals; we show that station and its distance, plus an honest confidence label. Your own yard can differ by a week or more, low-lying spots frost earlier, and cities and south-facing slopes stay warmer. Treat these as a reliable starting point, not a guarantee.
Where this data comes from
All public-domain government data, no proprietary garden sources:
- Hardiness zones: 2023 USDA Plant Hardiness Zone Map, ZIP listing published by the PRISM Climate Group, Oregon State University.
- Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals (annual/seasonal freeze/frost normals).
- ZIP locations: U.S. Census geocoder & 2023 ZCTA Gazetteer centroids.