Gardening in Wyoming

Everything we have worked out for Wyoming: what to plant and when, which varieties finish in time, the pests that actually turn up here, and the jobs that pay off month by month. We also cover the rest of the property, from lawns and soil to home care and energy, because a garden rarely stops at the vegetable bed.

The numbers first, because everything else follows from them. Measured at the weather station in Cheyenne, the last spring freeze runs May 7 to May 18 and the first fall freeze runs September 24 to October 5, USDA zones 3a-6a, 2,552 growing degree days in the year.

Garlic does well: 30.4 weeks below 40 °F, comfortably past the six it needs to form a proper head.

Elsewhere on the property in Wyoming: the pests that turn up here.

Figures from NOAA's 1991-2020 climate normals. A state is not one climate: elevation, a large lake or the coast can move these dates by two weeks either way, so check your own county with the extension service before you spend money.

When to Start Pepper Seed in Wyoming

When to Start Pepper Seed in Wyoming

Wyoming gardeners get one shot: seed peppers indoors 8 to 10 weeks before transplant, then move plants out only after the last frost, roughly May 7 to…

What Eats Potato in Wyoming, and When

Harvested root vegetables with dried foliage in a wooden raised garden bed, with a gray cottage and picket fence visible in the background.

University of Wyoming Extension documents a list of garden pests for the state, and about eight of them actually go after potato: Colorado potato beetle…

What Eats Parsnip in Wyoming, and When

Freshly harvested parsnips displayed on soil in a productive vegetable garden with mountains visible in the background.

In Wyoming, parsnip tops draw grasshoppers, aphids, cutworms, flea beetles, blister beetles, and garden slugs, while root maggots tunnel into the taproot…

What Do Homes in Wyoming Cool With?

What Do Homes in Wyoming Cool With?

Wyoming homes split their cooling between two different worlds. Seventy-one percent of households run some kind of air-conditioning equipment, but only…

When to Overseed a Lawn in Wyoming

Weeds sprouting along a concrete edge in a lawn area during warm season.

The safe window to overseed a cool-season lawn tied to the reference station used here runs roughly from the first two weeks of August through the third…

First and Last Frost Dates in Wyoming

First and Last Frost Dates in Wyoming

Wyoming’s average last spring frost falls between May 7 and May 18, and the first fall frost typically arrives between September 24 and October 5, based…