Plant Beets in Zone 3b

Zone 3b averages 128 frost-free days, running from a last spring frost around May 13 to a first fall frost around September 18. Beets needs roughly 55 days from planting out to first harvest, so it uses about 43 percent of that window. Beets is a hardy crop, which is what decides where in the window it belongs.

Beets handles cold soil, so there is no reason to wait for the frost date. Direct sow around Apr 22, roughly 3 weeks before the Zone 3b last frost, as soon as the ground is workable. Sowing at the last frost instead costs you the coolest and best part of the season.

Yes. Sow beets by August 1 in Zone 3b. That is 48 days before the average first frost, which covers the 55 days to maturity plus about two weeks for the slower growth that comes with shortening days, minus the roughly 21 days beets keeps going once light frost arrives.

Beets sown for fall give you two crops at once: greens within a month and roots that sweeten in cold soil.