Growing fennel in zone 3b

(Zone 3b = an average winter low of -35°F to -30°F.)

In USDA zone 3b, the typical last spring frost is May 17 and the first fall frost is September 23. Here is when to plant fennel against those dates.

Start seeds indoorsApril 5 to April 19

Direct sow outdoorsMay 17

Expected harvestJuly 16 to August 15About 60 to 90 days from sowing.

These are zone 3b averages

Computed from 224 ZIP codes in zone 3b. Your town's frost dates vary; enter your ZIP for dates built on your nearest weather station.

Get my exact dates

USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service / Oregon State University PRISM Group. NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020. Planting windows for fennel from Utah State University Extension. Zone dates are medians; local conditions vary.