Plants by Numbers

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6a Planting calendar for zone 6a

USDA hardiness zone 6a: average annual extreme minimum -10°F to -5°F. 5,187 US ZIP codes fall in this zone.

Freeze dates for zone 6a

Median dates across 1,132 NOAA weather stations in zone 6a (1991–2020 normals). In zone 6a, the average coldest night of the year falls between -10°F and -5°F.

ThresholdLast spring freeze (median)Typical rangeFirst fall freeze (median)Typical range
36°F (light freeze — tender plants hurt)May 10Apr 29 – May 30Oct 1Sep 21 – Oct 7
32°F (freeze)May 1Apr 18 – May 22Oct 10Sep 26 – Oct 19
28°F (hard freeze)Apr 21Apr 8 – May 10Oct 22Oct 3 – Oct 31

Growing season at 32°F (50% probability): —.

Planting calendar — zone 6a

Cropjanfebmaraprmayjunjulaugsepoctnovdec
Tomatoes··SS
D
T·······
Peppers··S·T·······
Cucumbers···S
D
T·······
Zucchini & Summer Squash···S
D
T·······
Winter Squash & Pumpkins···S
D
T·······
Snap Beans···D···F····
Sweet Corn···D········
Peas··D····F····
Lettuce···S
D
T··F····
Spinach··D····F····
Carrots···D···F····
Radishes··D····F····
Broccoli··SS
D
T··F····
Garlic·······F····
Potatoes···D········

S = start seeds indoors · T = transplant outside · D = direct sow · F = fall planting

Every crop, zone 6a