When to plant · 9 cities · zones 5b–7a

When to plant carrots in Idaho

Direct sow nantes carrot around Apr 30 — the Idaho statewide median, counted from a last spring frost of May 14 across 253 ZIP codes and 112 NOAA stations.

Apr 30Direct sowApr 10 – May 26 across the state
May 14Last spring frostmedian · 1 in 10 years after Jun 3
Jul 9First harvest70 days from sow

The rule: Direct sow two weeks before the last frost and keep the top half-inch of soil damp for the 14–21 days it takes to germinate.

Idaho carrots, by step

Statewide median last frost May 14, first fall frost Sep 29, 2027 season. Each cultivar's own indoor lead time and days to maturity, same engine as the Plan Builder.

CultivarStart indoorsSowFirst harvestDays
Nantes CarrotScarlet NantesDirect sowApr 30Jul 970 from sow

Tight means first harvest lands within two weeks of the median first fall frost. Statewide dates are the ZIP-weighted median of every NOAA 1991–2020 station Idaho's ZIP codes resolve to; 30 of 283 ZIPs have no datable freeze and are left out.

Carrots in Idaho, city by city

Nantes Carrot, scheduled from each city's nearest NOAA station — the same dates as its frost page.

CityLast frostSowFirst harvest
Boisezone 7aApr 24Apr 10Jun 19
Meridianzone 7aApr 24Apr 10Jun 19
Nampazone 7aApr 29Apr 15Jun 24
Caldwellzone 7aApr 29Apr 15Jun 24
Idaho Fallszone 5bMay 9Apr 25Jul 4
Pocatellozone 6aMay 2Apr 18Jun 27
Coeur d'Alenezone 6bApr 22Apr 8Jun 17
Twin Fallszone 7aApr 25Apr 11Jun 20
Post Fallszone 6bApr 22Apr 8Jun 17

What Idaho carrots need

SeedsThe cultivar decides the sauce. Everything downstream is damage control.
  • Scarlet Nantes Carrot Seed

    The carrot that makes a fermented habanero sauce work. It brings sweetness and body so the sauce has texture without thickener and heat without being one-dimensional.

StartSoil temperature and light intensity, indoors, weeks before your frost date.
  • Organic Seed Starter Potting MixMust have

    Seed-starting mix is not potting soil with a nicer label — it is finer, lighter, and low in nutrients on purpose, because a seedling's first roots want air and moisture, not fertiliser.

GrowRoot volume, nutrition and structure. Where most home crops actually fail.
  • Ocean Forest Potting SoilMust have

    Pre-charged with enough nutrition to carry a transplant for its first month without feeding, which is exactly the window when most container plants stall.

  • 5-Gallon Fabric Grow Bags, 5-Pack

    Fabric pots air-prune roots and drain faster than a plastic pot can, which is the entire reason container tomatoes fail. Five gallons is the honest minimum for a pepper; a tomato wants ten.

  • Rapitest Soil Test Kit

    In-ground growers are guessing until they test. pH outside 6.0–6.8 locks nutrients out no matter how much fertiliser you add, and no amount of feeding fixes that.

  • 3-in-1 Soil Moisture / Light / pH Tester

    Used for one thing — is the root zone actually dry six inches down — it prevents both halves of the most common container failure. Ignore the pH scale on it entirely.

HarvestTiming, handling, and weighing what you actually got.
  • Garden Harvest Basket with Tool Caddy

    A harvest basket that doubles as a colander means the hose rinse happens in the garden, and the dirt stays outside. On a 20-pound tomato day that is a genuine time saving.

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Carrots in Idaho: questions

When should I plant carrots in Idaho?

Direct sow around Apr 30 at the statewide median; across the state that date runs from Apr 10 in the warmest tenth of Idaho's ZIP codes to May 26 in the coldest. To cut the freeze risk to one year in ten, count from Jun 3 instead of the median last frost. Use the city table for your own town.

When is the last frost in Idaho?

The ZIP-weighted median of NOAA 1991–2020 station medians is May 14. In the warmest tenth of Idaho's ZIP codes the median last frost falls on or before Apr 24; in the coldest tenth, on or after Jun 9.

When will Idaho carrots be ready to harvest?

Nantes Carrot planted on the statewide date is ready around Jul 9: 70 days from sow.

More for Idaho

Carrots in every state → · Idaho frost dates → · How frost-date math works →