When to plant tomato in zone 3a
A planting schedule for tomato in USDA hardiness zone 3a, where the typical last spring frost is around May 21, 2026 and the first fall frost around Sep 22, 2026. Dates are computed from NOAA frost normals for a representative location (ZIP 99602) — your exact dates depend on your address.
Tomato planting schedule for zone 3a
- Start seeds indoorsApr 14, 2026 – Aug 11, 2026
- Start hardening offMay 26, 2026 – Sep 15, 2026
- Transplant outdoorsJun 9, 2026 – Sep 22, 2026
Playing it safe with tender crops? Spring frost holds off until about Jun 2, 2026 in roughly 9 years out of 10.
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Free on one garden — no credit card. See the full tomato growing guide or the whole zone 3a calendar.
Tomato in other zones
More crops for zone 3a
Frost dates are NOAA 1991–2020 climate normals for a representative location (ZIP 99602) in zone 3a; your exact dates depend on your address. Schedules are guidance, not guarantees.