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When to plant summer squash in Wyoming

Wyoming spans USDA zones 4a–5b, so the right time to plant summer squash shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 17 in Casper to June 27 in Jackson — below are local dates for 11 cities, each computed from its own frost dates.

In Cheyennethe summer squash transplant out window (May 21–May 28) has passed for this year.
CityZoneLast frostFirst frostTransplant out
Cheyenne5bMay 14October 1May 21 – May 28
Casper5aMay 10September 29May 17 – May 24
Gillette4bMay 15October 1May 22 – May 29
Laramie4aJune 7September 4June 14 – June 21
Rock Springs5aMay 24September 24May 31 – June 7
Sheridan5aMay 21September 23May 28 – June 4
Evanston5aJune 12September 12June 19 – June 26
Green River5aMay 24September 22May 31 – June 7

Summer Squash in Wyoming: FAQ

When can I plant summer squash in Wyoming?

Across Wyoming, the time to transplant summer squash spans roughly May 17 in Casper to June 27 in Jackson, each following that city's local frost dates.

Does the summer squash planting date vary across Wyoming?

Yes. Wyoming publishes 11 cities with their own frost dates, so the right summer squash planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.

How long does summer squash take to grow in Wyoming?

Summer Squash takes about 45–60 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.

Planting reminders

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An email when it’s time to start seeds, transplant, and sow — timed to your frost dates. Double opt-in, one-click unsubscribe, no spam.

Summer Squash planting guide →All Wyoming cities →Wyoming planting calendar →
When to Plant Summer Squash in Wyoming — Frost-Based Dates by City — BlissGarden