PlantingWindowThe American Planting Almanac

When to plant celeriac in Minneapolis, Minnesota

April 23 – May 7

Transplant outdoors · typical Minneapolis year

Climate basis: NOAA station Lower St Anthony Falls, MN (USC00214884), 1 mi (2 km) from downtown Minneapolis (ZCTA 55401 centroid), elevation 754 ft, on the 1991–2020 climate normals. Transplant celeriac outdoors from approximately the dates above, anchored to the median last spring 32°F freeze (April 23). One year in ten still freezes after May 7.

Last spring freezeApril 231-in-10 after May 7
First fall freezeOctober 161-in-10 before Oct 2
Frost-free season≈ 175 daysmedian at 32°F
Hard freeze, 28°Apr 14 – Oct 27kills even hardy greens
USDA zone5a-20 to -15°F winter low — not frost timing

The Minneapolis year

Start seeds indoorsFeb 12 – Feb 26
Transplant outdoorsApr 23 – May 7
  • indoors under lights
  • in the garden
  • frost-free season
  • 1-in-10 years still freeze to May 7
Celeriac in Minneapolis · freeze context from Lower St Anthony Falls, MN, 1991–2020 normals.

Every method, with its sources

Start seeds indoors

Feb 12 – Feb 26

The UC Master Gardener Program of Sonoma County (University of California Cooperative Extension) says to "Sow seed indoors as early as 10 weeks before the average last frost date in spring," so the sowing span opens ten weeks before the last frost and runs two weeks; no competing extension figure was found, so this stands without reconciliation. Anchored to the median last spring freeze (Apr 23). University of California Cooperative Extension, UC Master Gardener Program of Sonoma County

Transplant outdoors

Apr 23 – May 7

The same UC Master Gardener page states plants "can go into the garden 10-12 in. apart on the average date of last frost," a point rule that opens a 14-day transplanting span at the last frost date; the page's alternative air- and soil-temperature condition is not frost-anchored and was therefore not encoded. Anchored to the median last spring freeze (Apr 23). University of California Cooperative Extension, UC Master Gardener Program of Sonoma County

Variety assumption: Assumes a standard 100-to-120-day celeriac variety grown from transplants; germination is slow, so the long indoor lead time is part of the published rule rather than an added buffer.

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 (1)

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