Gardening in Utah

Everything we have worked out for Utah: 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 Salt Lake City, the last spring freeze runs April 12 to April 29 and the first fall freeze runs October 18 to October 29, USDA zones 4a-9a, 3,551 growing degree days in the year.

Garlic does well: 26.1 weeks below 40 °F, comfortably past the six it needs to form a proper head.

Elsewhere on the property in Utah: 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 Eats Onion in Utah, and When

Freshly harvested onions with soil and roots displayed in a garden setting with fence and grass visible in the background.

Two insects do most of the damage to onions in Utah: onion thrips, which chew the leaves, and onion maggots, which tunnel into the base.

When to Start Pepper Seed in Utah

When to Start Pepper Seed in Utah

In most of Utah, pepper seed goes into trays somewhere between early February and early March indoors, timed backward from the average last spring frost…

What Eats Parsnip in Utah, and When

Three freshly harvested parsnips lying on dark garden soil with coniferous forest and mist in the background.

Utah State University Extension documents six insect and mollusk pests that show up on parsnip foliage and seedlings here: aphids, flea beetles…

What Do Homes in Utah Cool With?

What Do Homes in Utah Cool With?

Air conditioning in Utah runs on central systems more than almost anywhere else in the country: 92% of homes cool with some kind of AC equipment, and 79%…

When to Overseed a Lawn in Utah

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

For most of Utah, the safe overseeding window falls between late August and mid-September, with the exact cutoff depending on how close your yard sits to…

First and Last Frost Dates in Utah

First and Last Frost Dates in Utah

In the Salt Lake City area, the last spring frost typically falls between April 12 and April 29, and the first fall frost lands between October 18 and…