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Zone 3b planting calendar

When to start vegetables in USDA hardiness zone 3b. Typical last spring frost around May 17, 2026 10 days year to year), first fall frost around Sep 26, 20269 days). Based on 235 ZIP codes in the zone — exact dates vary by location.

Playing it safe? Spring frost holds off until about May 29, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

Want exact dates for your address, a drag-and-drop bed layout, and reminders when it’s time to sow? Enter your ZIP:

Or get a printable 3b calendar and sowing reminders by email:

Still time to plant

As of today, these crops can still reach harvest before zone 3b’s first frost (~Sep 26, 2026) — fastest first.

Month by month in zone 3b

February

March

April

May

June

July

August

Frost dates are NOAA 1991–2020 climate normals for a representative location (Hannah, ND) in zone 3b; your exact dates depend on your address. Schedules are guidance, not guarantees.