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Planting calendar for ZIP 81220 (Cimarron, CO)

When to plant vegetables in Cimarron, CO (USDA hardiness zone 5b). Typical last spring frost around Jun 20, 2026 13 days year to year), first fall frost around Sep 10, 202612 days).

Playing it safe? Spring frost holds off until about Jul 6, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Cimarron, CO

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 81220: NOAA 1991-2020 normals (USC00051609 CIMARRON, CO US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.