The New Almanac

USDA Zone 7a

Zone 7 · The Upper South

Average annual extreme minimum temperature: 0 to 5 °F (-17.8°C to -15°C).

The Piedmont and interior Mid-Atlantic, the Southern Plains' northern reach — 0 to 10°F winters and the first zone where gardening becomes a genuine three-season practice: spring, summer, and a fall garden that rivals spring.

By the numbers

Median last frost
April 16
Median first frost
October 25
Median season
192 days
ZIPs tracked
4,022

Medians across every ZIP we track in zone 7a, derived from NOAA 1991–2020 climate normals. Look up your own ZIP for local dates — within a zone, frost varies by weeks.

Where you'll find zone 7

The Upper South and interior Mid-Atlantic: the Carolina and Virginia Piedmont (South Carolina's Upstate is largely 7b), north Georgia's hills, Tennessee and Kentucky uplands, the Ozarks' southern flank, and the Texas Panhandle south through Lubbock (7b).

Vegetables that earn their keep

  • Three-season staples (NC State central-NC calendar): tomato transplants mid-April–mid-June AND again mid-July–mid-August for fall
  • Broccoli transplants in two windows: mid-Feb–mid-April and mid-July–mid-Sept
  • Collards seeded into fall, mid-Aug–mid-Nov — the classic Southern winter green
  • All cool-season crops in spring and fall; all warm-season crops through summer (NC State)

Fruits & perennials that overwinter

  • Figs — the signature zone-7 fruit: 'Celeste', 'Brown Turkey', 'Brunswick' (the most cold-hardy of the three; NC State)
  • The full temperate orchard: apples, peaches, tart cherries, brambles — winter chill is ample here

Three seasons, two tomato plantings

NC State's central-Carolina calendar makes the zone-7 rhythm explicit: a spring tomato planting in April and a second in late July for fall harvest. Cool-season crops bracket the year — broccoli in February and again in August, collards sown into November. The gardener's challenge shifts from beating frost to scheduling around heat.

The mid-90s stall

Warm-season vegetables "temporarily stop bearing during heat waves" in the mid-90s (NC State). It isn't disease and it isn't your watering — fruit-set simply pauses until the heat breaks. The fall planting exists partly to catch the superior set that comes with September's cooler nights.

Figs on the edge

Zone 7 grows figs, but on probation: at 20°F or below they can freeze to the ground, regrowing from the roots with a lost season of fruit (NC State). The playbook is variety choice (Brunswick, Celeste, Brown Turkey), a northern exposure that delays spring wake-up, soil mounded a foot or two over the base in late fall, and a straw-or-tarp wrap in severe cold snaps. Cold and nematodes are the two limiting factors (NC State).

Whiteflies set the fall calendar

Late summer's whitefly peak is why fall transplants often wait until populations decline with cooler weather (NC State). Patience in August beats replanting in September.

Stretching the shoulders

Clemson's season-extension kit fits zone 7 perfectly: light row covers hold to about 28°F, heavier ones deeper; a south-facing cold frame (vented on sunny days to stay under 60°F) carries greens and root crops through winter — making zone 7 functionally a four-season food garden.

Plant guides, timed to your frost dates

Every guide gives its planting calendar relative to your last frost — the dates above (or your ZIP's) drop straight in.

Sources