Rochester, New Hampshire, sits in USDA hardiness zone 6a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
On paper, cabbage, hazelnut, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Rochester, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Rochester lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Rochester — soil, climate, flood, and parcel records. How we handle your address.
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Rochester — the short answer
Rochester, New Hampshire: USDA zone 6a, about 187 days between hard freezes, across 29K acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~187
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 29K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 6a is Rochester's average, not your lot's — a low corner or a tree line moves it. Against Rochester's 187-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rochester
Each reading below is measured for Rochester itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRochester runs about 187 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredRochester sits in USDA hardiness zone 6a.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Rochester is in
Rochester sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Rochester's own centroid rather than borrowed from Strafford County.
What Grows in Rochester
Every plant below cleared Rochester's own zone 6a and its 187-day season. Each card opens that plant's New Hampshire profile. How we score.
Is it too late to plant in Rochester?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 23 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
Documented around Rochester
Spotted lanternfly documented 14 miles from Rochester, first recorded 2022. What to watch for.
What's on the federal record near Rochester
Closest first, within ~10 miles of Rochester. Listing isn't leaking, and distance isn't exposure.
- ACTION MFG. INC.Toxics Release Inventory · 950 ft
- CUMBERLAND FARMS 2816Underground Storage Tanks · 1400 ft
- US ARMY NATIONAL GUARD CENTER STRAFFORD TRAINING SITEToxics Release Inventory · 1400 ft
- WALGREENS 3520Brownfields · 1500 ft
- ROCHESTER HARDWAREUnderground Storage Tanks · 1500 ft
- ZELLAR AUTOMOTIVEUnderground Storage Tanks · 1500 ft
- HYDER ENTERPRISESUnderground Storage Tanks · 1600 ft
- FORMER MOBIL #10544Underground Storage Tanks · 1600 ft
- RAY BEAUDOIN & SONS INCUnderground Storage Tanks · 1600 ft
- BOWLAWAY LANESUnderground Storage Tanks · 1700 ft
- AUTOZONE 3221Brownfields · 1700 ft
- FORMER CARE PHARMACYUnderground Storage Tanks · 1700 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Rochester's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Rochester.
Sources Checked
within ~10 miles of Rochester
Severity Distribution
within ~10 miles of Rochester
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Rochester, Toxics Release Inventory runs higher than the national average — 50 sites within ~10 miles of Rochester. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Rochester
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Rochester average
Your land is one point inside Rochester
Everything above resolves to Rochester as a whole — one PHZM band and one 28°F frost record, read across 29K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at city scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Rochester Average
Rochester Average
- ●USDA Zones 6a, averaged across Rochester
- ●One soil character for all of Rochester
- ●Frost dates read at Rochester's scale: Apr 19 to Oct 23
YOUR Parcel
- ✓Your exact zone, not Rochester's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rochester
Pull a site-specific report for your exact address in Rochester, New Hampshire — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rochester averages can't show:
We read public map data around Rochester — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rochester average
How we know this about Rochester
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Rochester’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at city grain anywhere on this page — there is no city-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Rochester
When does frost risk typically end in Rochester?
The last hard freeze (28°F) in Rochester typically lands around Apr 19, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about May 10.
When is the first frost in Rochester?
The first hard freeze (28°F) in Rochester typically arrives around Oct 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 9, so the watching starts about Sep 23 — about 187 days after the spring freeze cleared.
How long is the growing season in Rochester?
Measured between 28°F hard freezes, Rochester sees about 187 frost-free days — roughly Apr 19 through Oct 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 10 to Oct 9, about 152 days.
Is the soil safe to grow vegetables in Rochester?
The federal record around Rochester runs heavier than most — 584 documented sites, mostly Underground Storage Tanks entries (291), the nearest Toxics Release Inventory record about 0.2 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Rochester?
From about Sep 23 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Oct 23 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Oct 23. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rochester's scale — its 6a band and its 187-day season. Your yard writes its own version of Rochester's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Rochester’s own scale
7 of the readings below were taken at Rochester's own scale — its own ~187-day season between 28°F freezes, the 28,813 acres it covers and 584 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Rochester's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Rochester's own 28°F hard-freeze dates, about Apr 19 and Oct 23 and the ~187-day span between themNOAA 1991–2020 Climate Normals
- 584 documented contamination sites on the federal record near Rochester, the closest Toxics Release Inventory record about 0.2 miles out from the town centreFederal environmental registers
- Rochester's boundary and the 28,813 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~187-day seasonGrowable Ground crop-matching engine
- The ecoregion at Rochester's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Rochesterlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Rochester's 28,813 acres read through its county's SSURGO summaryfrom Strafford County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Strafford County
- The growing challenges every New Hampshire grower plans around — written at state scale, so they stay on the state guidefrom New Hampshire
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Strafford County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Rochester's 28,813 acreswhy one lot differs from the next →
- Which side of Rochester you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 28,813 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory record about 0.2 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Rochester-wide figureread your own land →
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