When to Sow Parsnips in Idaho
Boise’s coldest month averages a nightly low of 25.4°F, cold enough to hand parsnips the sustained chill they need to turn starch into sugar.
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.
Will Parsnips Sweeten in Idaho?
Yes, parsnips will sweeten in the Boise area of Idaho. The reference station’s coldest month averages a daily minimum of 25.4°F, cold enough to deliver…
Growing Spinach in Idaho: When Will It Bolt?
Spinach bolts fast in Idaho’s Treasure Valley because the crop answers to two triggers at once: long summer daylight and heat above 75 F.
When to Sow Carrots in Idaho: Counting Back From the Last Frost
Idaho gardeners are told to count backward from the last spring frost when timing carrot seed, but the calendar is only half the story.
Will Carrots Fork in Idaho Soil?
Idaho’s benchmark soil, the Threebear series, is a light volcanic-ash Andisol that holds water and phosphorus well and runs closer to silt loam than…
When to Sow Beets in Idaho
Beets go into Idaho ground two to three weeks before the last spring frost, which at the reference station falls somewhere between April 23 and May 7.
Beet Soil in Idaho: What the Root Will Meet
Idaho’s official representative soil, the Threebear series, is a light volcanic-ash Andisol that holds moisture and phosphorus unusually well but runs…
Growing Parsnips in Idaho: Will They Sweeten?
Idaho’s parsnips do sweeten, and the reason has nothing to do with the state’s cold reputation in general.
Why Peppers Fail to Set Fruit in Idaho
Peppers in Idaho stall out for one of two reasons: a stretch of 90-degree-plus days that sterilizes pollen inside the bloom, or a run of cool nights that…
Growing Pumpkins in Idaho: Will They Ripen in Time?
Idaho’s answer depends entirely on where you’re standing. In the Boise valley, a pumpkin sown and tended with care can ripen before the ground freezes…