When should I plant tomatoes in ZIP 55401?

In ZIP 55401, the main tomatoes target is around May 17, based on the representative Minneapolis frost station and USDA zone 5a.

When should I start tomatoes seeds indoors in 55401?

Start tomatoes seeds indoors in ZIP 55401 around Mar 29, about 42 days before the May 10 last-frost estimate.

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 55401 planting calendar

When to plant tomatoes in Minneapolis, MN - Zone 5a

Q: When is the first frost in Minneapolis?

Minneapolis (ZIP 55401) has an average first fall frost around Oct 1, leaving about 144 frost-free days.

In ZIP 55401, plant tomatoes around May 17; this uses the Minneapolis frost station, USDA zone 5a, and tomatoes timing rules.

Your Minneapolis calendar has a 144-day estimated frost-free season. This estimate uses the representative Minneapolis frost station, USDA zone 5a, and tomatoes timing rules.

Source: minneapolis-st-paul frost station, USDA zone 5a, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

Reviewed by GrowZone Editorial. Calculated from the minneapolis-st-paul frost station and USDA zone 5a, last updated 2026-06-28.

In the Minneapolis area, gardeners usually wait until May 17 to set tomato transplants out because cold snaps near May 10 can still matter.

USDA zone 5a Minneapolis frost station University of Minnesota Extension Updated 2026-06-28

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Answer first

When to start tomatoes seeds indoors in Minneapolis

In ZIP 55401, start tomatoes seeds indoors around Mar 29, about 42 days before the May 10 last-frost estimate.

Start tomatoes seeds indoors in Minneapolis around Mar 29, about 42 days before the May 10 last-frost estimate.

Seed starting schedule

Tomatoes dates for Minneapolis, MN

Step	Date	How to use it
Start Indoors	March 29, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	May 17, 2026	Move hardened-off seedlings outside after the frost-risk window.

Last frost

When is the last frost in Minneapolis?

Minneapolis (ZIP 55401) has an average last spring frost around May 10.

First frost

When is the first frost in Minneapolis?

The average first fall frost is around Oct 1, giving about 144 frost-free days.

Season map

Tomatoes windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Mar 29

Transplant

May 17

Harvest

Aug 3

Frost watch

Jul 15

Reminder workflow

Every date has a next action

Start tomatoes indoorsMar 29

Last frost windowMay 10

Transplant tomatoesMay 17

Last tomatoes sowing targetJul 15

First tomatoes harvest windowAug 3

Signal	Value	Why it matters
Last frost estimate	May 10, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	October 1, 2026	Fall planting counts backward from this date.
Season length	144 days	Longer seasons can support succession crops.
Spacing	18-24 in	Airflow and root space affect yield.
Soil temperature	60 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Minneapolis frost history and USDA zone 5a shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

University of Minnesota 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

Tomatoes timing notes

Harden seedlings off for a week before transplanting. Tomatoes prefers full sun, 18-24 in spacing, and soil near 60 F+.

For fall, count backward from Oct 1. A conservative last sowing target is around Jul 15.