Will Sweet Corn Ripen in Idaho?
In the Boise-area valley, sweet corn ripens most seasons but the timing runs tighter than gardeners expect.
Gardening in Idaho
Everything we have worked out for Idaho: 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 Boise, the last spring freeze runs April 23 to May 7 and the first fall freeze runs October 7 to October 21, USDA zones 3b-7b, 3,309 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 Idaho: 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 Sow Sweet Corn in Idaho
In most of Idaho’s valleys, soil warms enough for sweet corn seed by late May, sometimes into early June at higher ground, well after the last frost has…
When to Sow Autumn Spinach in Idaho
Sow autumn spinach in Idaho’s low valleys once the soil has cooled below 80 F, which typically happens by mid-to-late August, aiming for 50 to 75 days…
Will Spinach Bolt Early in Idaho?
In Idaho’s low valleys, the answer is yes. Spinach will bolt early, and it isn’t really a question of how cool the summer feels.
Will Idaho Soil Hold an Asparagus Bed for Fifteen Years?
Idaho’s representative soil, an Andisol built from volcanic ash, drains moderately well on its own terms, and that happens to be the only soil…
When to Plant Asparagus Crowns in Idaho
Around early spring, timed to this territory’s last-frost window of April 23 to May 7, is when asparagus crowns go into Idaho ground.
Growing Sweet Corn in Idaho: Will It Ripen?
Yes, in most of the Treasure Valley around Boise, sweet corn ripens reliably in a normal season.
Growing Asparagus in Idaho: Fifteen Years in One Spot
A bed of asparagus outlives most fences, most roofs, and plenty of marriages: once the crowns go in, they’re expected to keep producing for 10 to 15 years.
When to Sow Pumpkins in Idaho
In the Boise area, pumpkin seeds go into the ground once the soil warms to 65 F, generally sometime between mid-May and early July depending on elevation…
Will Pumpkins Ripen Before Frost in Idaho?
For gardeners near Boise, the answer is yes, but only if the vine’s flowers open before mid-August to early September.