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Planting calendar for ZIP 85618 (Mammoth, AZ)

When to plant vegetables in Mammoth, AZ (USDA hardiness zone 9a). Typical last spring frost around Feb 4, 2026 22 days year to year), first fall frost around Dec 8, 202615 days).

Playing it safe? Spring frost holds off until about Mar 4, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Mammoth, AZ planting calendar for dates typical of the whole city.

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Month by month in Mammoth, AZ

January

February

March

September

October

November

December

Understand your frost dates

Frost dates for ZIP 85618: NOAA 1991-2020 normals (USC00027530 SAN MANUEL, AZ US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.