Gardening in Colorado

Everything we have worked out for Colorado: 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 Denver, the last spring freeze runs May 1 to May 11 and the first fall freeze runs September 30 to October 12, USDA zones 3b-7b, 3,401 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 Colorado: 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.

What Do Homes in Colorado Cool With?

What Do Homes in Colorado Cool With?

Colorado homes cool with a mix dominated by central air: 57% of households run a central system, another 20% rely on an individual unit like a mini-split…

When to Overseed a Lawn in Colorado

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

Overseed cool-season lawns in Colorado between mid-August and early September, and warm-season lawns like bermudagrass or zoysia in late spring once soil…

First and Last Frost Dates in Colorado

First and Last Frost Dates in Colorado

Colorado’s frost dates aren’t one number, they’re a window. At the Denver International Airport station, the data used for statewide reference, the last…