PlantingWindowThe American Planting Almanac

When to plant celeriac in Washington, District of Columbia

March 24 – April 7

Transplant outdoors · typical Washington year

Climate basis: NOAA station Washington Reagan AP, VA (USW00013743), 3 mi (5 km) from downtown Washington (ZCTA 20004 centroid), elevation 10 ft, on the 1991–2020 climate normals. Transplant celeriac outdoors from approximately the dates above, anchored to the median last spring 32°F freeze (March 24). One year in ten still freezes after April 6.

Last spring freezeMarch 241-in-10 after Apr 6
First fall freezeNovember 181-in-10 before Nov 5
Frost-free season≈ 241 daysmedian at 32°F
Hard freeze, 28°Mar 12 – Dec 3kills even hardy greens

The Washington year

Start seeds indoorsJan 13 – Jan 27
Transplant outdoorsMar 24 – Apr 7
  • indoors under lights
  • in the garden
  • frost-free season
  • 1-in-10 years still freeze to Apr 6
Celeriac in Washington · freeze context from Washington Reagan AP, VA, 1991–2020 normals.

Every method, with its sources

Start seeds indoors

Jan 13 – Jan 27

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 (Mar 24). University of California Cooperative Extension, UC Master Gardener Program of Sonoma County

Transplant outdoors

Mar 24 – Apr 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 (Mar 24). 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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