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Planting calendar for ZIP 81633 (Dinosaur, CO)

When to plant vegetables in Dinosaur, CO (USDA hardiness zone 5b). Typical last spring frost around May 10, 2026 11 days year to year), first fall frost around Oct 4, 202611 days).

Playing it safe? Spring frost holds off until about May 24, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Dinosaur, CO planting calendar for dates typical of the whole city.

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Month by month in Dinosaur, CO

February

March

April

May

June

July

August

Understand your frost dates

Frost dates for ZIP 81633: NOAA 1991-2020 normals (USC00055422 MASSADONA 3E, CO US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.