When to plant carrots in Spokane, Washington

April 12 – April 26

Direct-sow outdoors · typical Spokane year

Climate basis: NOAA station Spokane INTL AP, WA (USW00024157), 5 mi (8 km) from downtown Spokane (ZCTA 99201 centroid), elevation 2353 ft, on the 1991–2020 climate normals. Direct-sow carrots from approximately the dates above, anchored to the median last spring 32°F freeze (April 26). One year in ten still freezes after May 10.

Last spring freezeApril 261-in-10 after May 10

First fall freezeOctober 121-in-10 before Sep 29

Frost-free season≈ 168 daysmedian at 32°F

Hard freeze, 28°Apr 6 – Oct 23kills even hardy greens

USDA zone7a0 to 5°F winter low — not frost timing

The Spokane year

Direct-sow outdoorsApr 12 – Apr 26

indoors under lights
in the garden
frost-free season
1-in-10 years still freeze to May 10

Carrots in Spokane · freeze context from Spokane INTL AP, WA, 1991–2020 normals.

Every method, with its sources

Direct-sow outdoors

Apr 12 – Apr 26

Purdue: semi-hardy — 2–4 weeks before the last frost; Penn State's earliest sowing is Apr 17 for a May 1 frost (−14 days). The later Penn State start is used. Anchored to the median last spring freeze (Apr 26). Penn State Extension (York County Master Gardeners) · Purdue University Extension

Start seeds indoors

Not calculated

Root crops are not transplanted; carrots are direct-seeded.

Transplant outdoors

Not calculated

The cited extension guides do not time an outdoor transplanting window for this crop.

Fall planting

Not calculated

No source-backed fall planting rule exists for this crop in the registry, so no fall window is calculated.

Variety assumption: Assumes an average main-crop variety (about 65–80 days; Penn State lists 75).

These windows describe typical years (1991–2020 climate normals), not this year's forecast. Freezes happen outside them — especially in frost pockets, valleys, and urban edges. Watch the forecast before committing tender plants.

This week, not a typical year:

Crop rule sources (2)

Penn State Extension (York County Master Gardeners): Vegetable Seed Planting Guide (accessed 2026-07-24)
Earliest/latest sowing dates for a May 1 last-frost / Oct 1 first-frost baseline; offsets derived by date difference from May 1. Also days-to-maturity figures.
Purdue University Extension: Indiana Vegetable Planting Calendar (HO-186-W) (accessed 2026-07-24)
Hardiness classes: hardy = plant 4-6 wk before last spring frost; semi-hardy = 2-4 wk before; tender = after average last frost; very tender = at least 2 wk after. Table 2: fall planting at least 4-8 wk before first fall frost.

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