Gardening in Iowa

Everything we have worked out for Iowa: 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 Des Moines, the last spring freeze runs April 12 to April 24 and the first fall freeze runs October 14 to October 25, USDA zones 4b-6a, 3,659 growing degree days in the year.

Garlic does well: 21.8 weeks below 40 °F, comfortably past the six it needs to form a proper head.

Elsewhere on the property in Iowa: 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 Pepper in Iowa, and When

An arrangement of fresh chili peppers ranging from green to red, displayed on a rustic wooden table with kitchen tools and ground chili powder.

In Iowa, the pepper pests documented by Iowa State University Extension are limited: common stalk borer tunneling into stems, grasshoppers that shred…

What Eats Onion in Iowa, and When

Freshly harvested onions of various colors arranged in garden soil with growing plants and harvest basket visible in background.

Two insects show up on Iowa onions with any regularity: the common stalk borer, which tunnels into the stalk and leaves a single leaf wilting from the…

What Eats Corn in Iowa, and When

Fresh corn with husks, a tomato, and a cross-section of corn cob displaying seeds and interior structure on a neutral gray background.

Iowa State University Extension tracks nine insect species commonly reported in home gardens and landscapes across the state, and only four of them are…

What Eats Pumpkin in Iowa, and When

A glowing carved jack-o-lantern sits on a weathered wooden deck railing overlooking a bare autumn landscape at sunset.

Iowa State University Extension documents nine insects on garden and vegetable crops in the state, but pumpkin only draws the attention of some of them…

What Eats Potato in Iowa, and When

A freshly harvested potato sits on dark soil with cutting board, basket, and additional potatoes visible in the background.

Iowa State University Extension documents three insects that actually feed on potato in home gardens: common stalk borer, grasshoppers, and spotted…

What Eats Parsnip in Iowa, and When

Three pale parsnips rest on frost-covered soil with dried leaves and a weathered wooden fence in the background.

In Iowa, parsnip tops and stems draw generalist feeders more than crop specialists: grasshoppers, common stalk borer, Japanese beetle, and spotted…

What Eats Beet in Iowa, and When

Freshly harvested dark red and golden beets with soil displayed in a raised garden bed with watering can and tools visible in background.

What eats beet in Iowa, according to Iowa State University Extension’s documented pest list, comes down to three generalist feeders: grasshoppers, the…

When to Overseed a Lawn in Iowa

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

Overseeding in Iowa depends on soil temperature and the first fall frost, not a set date, and the safe window shifts by county.

First and Last Frost Dates in Iowa

First and Last Frost Dates in Iowa

Iowa’s last spring frost typically falls between April 12 and April 24, and the first fall frost arrives between October 14 and October 25, according to…