When to plant bulb fennel in Lexington, Kentucky

April 13 – April 27

Direct-sow outdoors · typical Lexington year

Climate basis: NOAA station Lexington Bluegrass AP, KY (USW00093820), 6 mi (10 km) from downtown Lexington (ZCTA 40507 centroid), elevation 980 ft, on the 1991–2020 climate normals. Direct-sow bulb fennel from approximately the dates above, anchored to the median last spring 32°F freeze (April 13). One year in ten still freezes after May 1.

Last spring freezeApril 131-in-10 after May 1

First fall freezeOctober 281-in-10 before Oct 16

Frost-free season≈ 196 daysmedian at 32°F

Hard freeze, 28°Mar 31 – Nov 6kills even hardy greens

USDA zone7a0 to 5°F winter low — not frost timing

The Lexington year

Start seeds indoorsMar 2 – Mar 16

Direct-sow outdoorsApr 13 – Apr 27

indoors under lights
in the garden
frost-free season
1-in-10 years still freeze to May 1

Bulb Fennel in Lexington · freeze context from Lexington Bluegrass AP, KY, 1991–2020 normals.

Every method, with its sources

Start seeds indoors

Mar 2 – Mar 16

Wisconsin Horticulture (University of Wisconsin-Madison Division of Extension) states "Plants can be started indoors 4 to 6 weeks before the last spring frost," giving a sowing span from six to four weeks ahead of the last frost; no competing extension figure was found, so it is encoded as printed. Anchored to the median last spring freeze (Apr 13). University of Wisconsin-Madison Division of Extension (Wisconsin Horticulture)

Direct-sow outdoors

Apr 13 – Apr 27

The same Wisconsin Horticulture article says to "Sow seeds about ¼ inch deep after the last frost in spring, or in mid-summer for a fall crop of Florence fennel," and the first clause is a point rule at the last frost that opens a 14-day sowing span; the article's mid-summer alternative is a fixed-calendar rule with no frost relation and so was not encoded. Anchored to the median last spring freeze (Apr 13). University of Wisconsin-Madison Division of Extension (Wisconsin Horticulture)

Variety assumption: Assumes a bulbing Florence type (finocchio) rather than the non-bulbing herb fennel grown for leaf and seed; the cited article covers Foeniculum vulgare generally but names Florence fennel explicitly in its sowing sentence.

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)

University of Wisconsin-Madison Division of Extension (Wisconsin Horticulture): Fennel, Foeniculum vulgare, Susan Mahr (accessed 2026-07-25)
"Plants can be started indoors 4 to 6 weeks before the last spring frost."

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