Yes — Strong Match
peppermint is grown in zones 3-11, which covers every zone Maryland contains (5b-8a). Whether the season is long enough is the question that remains.
Peppermint in Maryland — the short answer
Peppermint in Maryland: grown in zones 3–11, full sun.
- Plant zones
- 3-11
- Not verified — NC State Extension Gardener Plant Toolbox lists zones 5a–9b
- Maryland zones
- 5b-8a
- USDA PHZM 2023
- Frost window
- Mar 18 - Mar 29 – Nov 11 - Nov 27
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 190 days
- NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze
- Days to maturity
- 90 days
- Growable Ground Plant Database
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — per-field provenance varies and is published with the dataset.
Your yard isn't the whole zone.
Maryland spans zones 5b-8a, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score peppermint against your parcel's actual hardiness, soil, and sun.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
No card required · your parcel report in seconds — read in full free for your first 14 days
Maryland is not one climate
A single Maryland answer averages 24 counties whose growing seasons are 80 days apart — from 190 frost-free days in Garrett County to 270 in Talbot County. Which end of that your land sits nearer changes what peppermint can finish before the first hard freeze.
The middle half of 24 counties runs 225–255 days, with a median of 237 days — a 80-day span end to end.
Measured across 24 Maryland counties. NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze. Quartiles are order statistics — every figure shown is a value a real county recorded, not an interpolation. Your own site sits somewhere inside this range; a parcel report resolves where.
Where in Maryland Fits Best
Even within Maryland's zones 5b-8a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for peppermint (USDA PHZM 2023):
Zone Comparison
Peppermint Needs
- USDA Zones: 3-11
- Sun: Full Sun
- Mature size: 2 ft tallWe haven't confirmed this against a published source yet.
- Picking window: ~150 days of harvestWe haven't confirmed this against a published source yet.
- Drought tolerance: LowWe haven't confirmed this against a published source yet.
Maryland Has
- USDA Zones: 5b-8a
- Last Hard Freeze (28°F): Mar 18 - Mar 29
- First Hard Freeze (28°F): Nov 11 - Nov 27
- Annual Rainfall: 36-48 inches
- Common Soils: Silt loam, Clay, Sandy loam (Eastern Shore)
Plant Zone Range (zones 3-11)
Preferred Soil pH
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS, and university Extension sources — per-field provenance varies and is published with the dataset. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Peppermint in Maryland
The frost window
Across Maryland, the last spring hard freeze (28°F) clears between Mar 18 and Mar 29, and the first fall hard freeze lands between Nov 11 and Nov 27 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 227-day window you can count on — up to 254 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
Winter standing
Maryland runs as cold as USDA zone 5, and no sourced winter-hardiness floor is on record for peppermint, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether peppermint is a permanent planting or a replant-every-spring crop for you turns on your own zone within Maryland; check its hardiness range against that before treating it as long-lived ground.
Timing tuned to sub-state frost dates — Garrett County, not the statewide average.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: Growable Ground Plant Database — frost-free days from FAO ECOCROP, days to harvest from university Extension production guides, and growing-degree-day and chill-hour minimums that are compilation estimates rather than published figures. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Peppermint is grown in zones 3–11, which covers every zone Maryland contains (5b-8a). We have no sourced winter-survival figure for peppermint, so this page does not say whether it overwinters here. Maryland's typical season runs ~238 frost-free days against the ~40 peppermint needs.
Growing degree days
Peppermint needs ~900 GDD (base 50°F) to ripen. We haven't confirmed this against a published source yet. The state median runs ~3789 GDD (from PRISM 1991-2020 climate normals), so Maryland's typical season clears that easily.
GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.
Soil + Drainage Fit
Peppermint tolerates a wide pH range (pH 4.5-8.3) — 3.8 units, acid ground through alkaline — so soil acidity is rarely what limits it in Maryland. A soil test is still worth having, but for what else it tells you about this site, not to clear this plant. It will grow across that whole span, but it does best between pH 5.5 and 6.5 — worth knowing before you decide whether a Maryland soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your Maryland site is heavier clay or sits in a low spot, a raised bed lifts the roots above wet ground, or work in compost. Drainage need: We haven't confirmed this against a published source yet.
Your land, not the state average
SSURGO maps about 16.1% of Maryland as poorly or somewhat-poorly drained, and the class flips parcel to parcel. Peppermint has low drought tolerance, so it is the fast-draining end that will cost you — your soil map unit, not the state average, is the real answer.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH requirements: FAO ECOCROP and USDA PLANTS, with the remaining rows from other published sources or Growable Ground compilation. Drainage: FAO ECOCROP, with the remaining rows from other published sources or Growable Ground compilation. Maryland soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Before you plant peppermint for food
Anything you grow to eat takes up what is in the ground it grows in, so what is on record near you is worth knowing before peppermint goes in. What follows is Maryland’s documented federal record at state scale — a screening signal, not a soil test, and not a statement about any one lot.
Safe to Grow Here?
What the federal record shows across Maryland — and how to grow with it.
We checked the federal record across Maryland — 14,511 documented sites across 7 of the 8 source types we track.
The most significant on record: 167 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Maryland carries one of the heavier federal records we track — and that's not a verdict on your yard. Proximity to a documented site is information, not a diagnosis: nothing here says any particular parcel is affected. It does earn one concrete step — before food beds go in the ground, a professional soil test tells you exactly what you're working with, and raised beds of imported, lab-tested soil grow well almost anywhere in the meantime.
Sources Checked
across Maryland
Severity Distribution
across Maryland
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Maryland, CAFO runs higher than the national average — 623 sites across Maryland. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Sources: EPA, USGS — 950K documented sites tracked nationwide across 8 federal source types.
What Else to Consider for Peppermint in Maryland
The zone range tells you where peppermint is grown — but Maryland growers also need to think about:
Heavy Piedmont clay drains poorly
Humidity and heat in summer promote disease
Deer pressure in suburban areas is extreme
Growing peppermint here specifically
Peppermint likes pH 4.5–8.3 and its growing tissue burns around 32°F (FAO ECOCROP), yet neither saves it from wet feet — SSURGO maps about 16.1% of Maryland poorly-drained, where its crown sit and rot.
Set peppermint high on bermed, grit-amended ground so winter and storm water drain away from the crown. How to handle it →
What to actually do about these — and the constraints that apply to every Maryland grower, not just peppermint — is covered on the Maryland growing guide.
Timing shifts within Maryland
Maryland isn't one climate. In Garrett County, the last hard freeze (28°F) holds until about Apr 22 — roughly 29 days later than the recorded state median — so plant peppermint to your county's window, not the statewide date.
County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). A parcel report resolves your address's own frost dates.
Where in Maryland Peppermint Is Zone-Hardy
Peppermint is rated for USDA zones 3–11. Every one of Maryland’s 24 counties sits inside that band — from Garrett County at zone 6a to Talbot County at zone 8a — so winter cold is not what decides this plant anywhere in the state. What is left to vary is your own parcel: slope, shelter and cold-air drainage routinely move a site half a zone either way from the county figure.
Across those 24 counties Maryland’s winter-low ladder runs from zone 6a in Garrett County to zone 8a in Talbot County — 2 USDA zones of spread, which is 20°F between the two counties’ average coldest night of the year. That is why a statewide hardiness answer is where you start and not where you finish.
The planting window moves with it. Garrett County holds its last hard freeze (28°F) until about Apr 22, while Talbot County is clear by Mar 10 — 43 days apart. Set peppermint out on your county’s date, not the state’s.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F killing freeze — earlier than the folk 32°F "last frost". Peppermint’s zone 3–11 band: Not verified — NC State Extension Gardener Plant Toolbox lists zones 5a–9b. A parcel report resolves your address’s own zone and frost dates rather than its county’s.
Pollinator + Wildlife Value
Peppermint draws honeybees, native bees, and butterflies (moderate value). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, peppermint can only work that bloom inside Maryland's frost window — roughly 238 days, opening after the last 28°F freeze (Mar 18 - Mar 29) and closing at the first (Nov 11 - Nov 27), per NOAA Regional Climate Centers ACIS, 1991-2020. Pollinator value: We haven't confirmed this against a published source yet.
Recommended Peppermint Varieties for Maryland
Maryland publishes no state variety trial for peppermint, so we won't invent a "best for Maryland" list. Choose types rated to your USDA hardiness zone (5b-8a), and confirm winter survival and drainage against your own parcel.
Maryland Cooperative Extension
For Maryland-specific cultivar recommendations, planting calendars, and pest pressure for peppermint, the canonical source is University of Maryland Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Common Questions About Growing Peppermint in Maryland
When can I plant Peppermint in Maryland?
Maryland's last spring hard freeze (28°F) clears between Mar 18 and Mar 29, and the first fall hard freeze lands between Nov 11 and Nov 27 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Peppermint, so this page does not state whether it overwinters in Maryland and publishes no fall establishment date for it — check its hardiness range against your own zone before treating it as a permanent planting.
What hardiness zone is Peppermint grown in across Maryland?
Maryland spans USDA hardiness zones 5b-8a (USDA ARS PHZM 2023). Peppermint carries a range of zones 3-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Maryland site have?
A typical Maryland site sees ~238 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Peppermint needs 40+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like Garrett, the freeze-free season runs shorter than the state average, so verify your own county's window.
How should I amend the soil for Peppermint in Maryland?
Peppermint tolerates pH 4.5-8.3 and well (dry spells) drainage. We haven't confirmed this against a published source yet. That is a 3.8-unit span, acid ground through alkaline, so pH is rarely what limits this plant on a Maryland site — amend for drainage and organic matter first.
Will Peppermint actually grow on my specific land in Maryland?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores peppermint against your address's mapped soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Maryland
State-level data is a sketch. Your Growable Ground report scores peppermint against your land's mapped soil, modelled sun, drainage, and frost data — not zone averages.
Three things about your lot that Maryland peppermint averages can't show:
We read public map data around Maryland — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Maryland peppermint average
Explore More
Growing guides for peppermint
Explore Maryland county by county
Maryland carries 24 counties with their own USDA zone — a sample of the growing pages for peppermint there:
Where else peppermint grows
Peppermint's zone band crosses state lines — these are the states closest to Maryland in winter climate where it also has a page, plus the far ends of its range. Each one re-answers the question with that state's own record.
More to grow in Maryland
Maryland has a growing page for 1,011 plants — a rotating sample of the rest of the shelf.
Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →
Cite this dataset
Kirchick, M. (2026). Growable Ground Plant Database [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21435643
Licensed CC BY-NC 4.0. DOI 10.5281/zenodo.21435643
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