Conditional — Some Areas
peppermint (zones 3-11) has limited zone overlap with Tennessee (6a-7b). Only zones 6-7 in the state are suitable.
Zone Comparison
Peppermint Needs
- USDA Zones: 3-11
- Soil pH: 4.5 - 8.3
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 40+
Tennessee Has
- USDA Zones: 6a-7b
- Last Frost: Mar 20 - Apr 20
- First Frost: Oct 10 - Nov 5
- Annual Rainfall: 45-55 inches
- Common Soils: Silt loam, Clay loam, Limestone-derived
Plant Zone Range (zones 3-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Peppermint wants 40+ frost-free days; a typical Tennessee site sees ~220 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Peppermint needs ~900 GDD (base 50°F) to ripen. The state median runs ~4200 GDD (USDA NRCS county aggregates), so Tennessee's typical season clears that easily.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Peppermint likes near-neutral soil (pH 4.5-8.3). That's the common-ground band across Tennessee's silt loam and clay loam — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Tennessee site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. Tennessee soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Peppermint in Tennessee — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 3-11 (USDA PLANTS Database)
- State Zones: 6a-7b (USDA ARS PHZM 2023)
- Growing Season: Mar 20 - Apr 20 to Oct 10 - Nov 5 (NOAA Climate Normals)
- Days to Maturity: 90 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Tennessee growers also need to think about:
Heavy clay soils in the Nashville Basin
High humidity promotes disease in summer
Variable spring weather with late frost risk
Pollinator + Wildlife Value
Peppermint draws pollinators (moderate value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Deer pressure is meaningful across much of Tennessee; peppermint is listed as deer-resistant (USDA PLANTS Database), which makes it a safer pick for unfenced sites.
Tennessee Cooperative Extension
For Tennessee-specific cultivar recommendations, planting calendars, and pest pressure for peppermint, the canonical source is UT Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Check your specific parcel in Tennessee
State-level data is a sketch. Your Growable Ground report scores peppermint against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
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