When should I plant carrots in ZIP 97204?

In ZIP 97204, the main carrots target is around Mar 11, based on the representative Portland frost station and USDA zone 9a.

When should I start carrots seeds indoors in 97204?

Carrots is usually direct-sown for ZIP 97204. Use the Mar 11 planting window instead of starting it indoors.

Is this a guaranteed planting date?

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

ZIP 97204 planting calendar

When to plant carrots in Portland, OR - Zone 9a

Q: When is the first frost in Portland?

Portland (ZIP 97204) has an average first fall frost around Nov 10, leaving about 223 frost-free days.

In ZIP 97204, plant carrots around Mar 11; this uses the Portland frost station, USDA zone 9a, and carrots timing rules.

Your Portland calendar has a 223-day estimated frost-free season. This estimate uses the representative Portland frost station, USDA zone 9a, and carrots timing rules.

Source: portland-intl frost station, USDA zone 9a, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

USDA zone 9a Portland frost station Oregon State University Extension Updated 2026-06-28

Read the method

Answer first

When to start carrots seeds indoors in Portland

In ZIP 97204, carrots is usually direct-sown around Mar 11 instead of started indoors.

Carrots is normally direct-sown in Portland. Use around Mar 11 as the outdoor planting window for ZIP 97204.

Seed starting schedule

Carrots dates for Portland, OR

Step	Date	How to use it
Direct Sow	March 11, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Portland?

Portland (ZIP 97204) has an average last spring frost around Apr 1.

First frost

When is the first frost in Portland?

The average first fall frost is around Nov 10, giving about 223 frost-free days.

Season map

Carrots windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Direct sow

Mar 11

Harvest

May 20

Frost watch

Sep 1

Reminder workflow

Every date has a next action

Direct sow carrotsMar 11

Last frost windowApr 1

First carrots harvest windowMay 20

Last carrots sowing targetSep 1

Signal	Value	Why it matters
Last frost estimate	April 1, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	November 10, 2026	Fall planting counts backward from this date.
Season length	223 days	Longer seasons can support succession crops.
Spacing	2-3 in	Airflow and root space affect yield.
Soil temperature	45 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Portland frost history and USDA zone 9a shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

Oregon State University Extension is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.

Crop note

Carrots timing notes

Direct sow only; carrots dislike transplanting. Carrots prefers full sun, 2-3 in spacing, and soil near 45 F+.

For fall, count backward from Nov 10. A conservative last sowing target is around Sep 1.