When Should You Transplant Celery?

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GardenSays

Transplant celery plants once frost danger is past and soil has warmed — in Minneapolis, MN, typically May 12 – May 19.

Transplant outside: May 12 – May 19
Last frost (typ.): May 5
First fall frost: Oct 5

In Minneapolis, MN, the typical last frost lands around May 5. Garden centers stock transplants well before it's actually safe to plant them. Celery plants are frost-tender, so wait for two conditions — frost danger past AND soil warmed — which here typically means May 12-May 19.

This year's transplant window (May 12 – May 19) has passed — dates shown are for planning next season.

Do this this week

1.Passed for this season — plan next spring: start seeds indoors ~Feb 10 – Mar 3, transplant ~May 12 – May 19

Calculated result · 3 verified sources · Checked 2026-07-18 · How we decide

The link reopens this exact calculation.

Why

That leaves roughly 139 days of growing season before the typical first fall frost (Oct 5) — enough for most varieties. In a short-season area, favor early-maturing varieties (check the days-to-maturity on the tag).

Frost kills tender seedlings outright, and cold soil stunts them even without frost — both dates matter.
The 50% frost date is a planning midpoint: a late frost is still possible, so keep covers handy for the first two weeks.

When this doesn't apply

UMN gives Minnesota calendar dates (seed in February, transplant mid-May) rather than a frost-relative figure; converted to a Minneapolis-relative estimate (last frost ~May 5) — same conversion method used throughout this project. No spacing figure found this round.
Season extenders (row covers, walls of water, cold frames) let you plant 2-3 weeks earlier than these windows.
Frost dates are area averages — low spots and valley floors run colder than the local average.

How this was calculated

1. Last spring frostMay 5Source guidance
Minneapolis, MN: typical (50% probability) last 32°F frost
2. Seed starting windowFeb 10 – Mar 3Calculated result
Celery: start indoors 10-13 weeks before your typical transplant date
3. Transplant windowMay 12 – May 19Calculated result
Celery is frost-tender: go out 7-14 days after the last frost, once soil has warmed
4. First fall frostOct 5Source guidance
Minneapolis, MN: typical first 32°F frost in fall — the season's endpoint

Data sources

University of Minnesota Extension — Planting the vegetable garden — Celery should be transplanted in mid-May; February is the optimal time to seed celery indoors. (checked 2026-07-18)
NOAA NCEI — 1991-2020 U.S. Climate Normals (freeze date probabilities) (checked 2026-07-15)
National Gardening Association — frost date lookup (checked 2026-07-15)

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