When to plant tomatoes, onions, potatoes, garlic and fall crops, counted from your own frost dates.
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Plant onion sets and transplants in the four weeks before your last frost, or in fall and winter in the Deep South. Dates for 27 cities and the onion type for every ZIP code's latitude.
Count back from your first fall frost: days to maturity plus a 14-day fall factor, and 14 more for tender crops. Last planting dates for 20 US cities from NOAA normals.
Plant potatoes two to four weeks before your last frost, once 4-inch soil reaches 45°F. Dates for 22 cities from NOAA normals and 12 springs of measured soil data.
Plant garlic in the two weeks either side of your first fall frost. Dates for 22 US cities from NOAA normals, checked against 11 local extension calendars.
Plant tomatoes once frost risk is low and nights reach 50°F, usually 3–4 weeks after the average last frost. Dates for 26 cities from NOAA normals.
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