Hopkinton, Rhode Island, sits in USDA hardiness zone 6b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Expect cabbage, hazelnut, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Hopkinton, 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 Hopkinton 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 Hopkinton — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Hopkinton — the short answer
Hopkinton, Rhode Island: USDA zone 6b, about 219 days between hard freezes, across 2K acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~219
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K 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 6b is Hopkinton's average, not your lot's — a low corner or a tree line moves it. Against Hopkinton's 219-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Hopkinton
Each reading below is measured for Hopkinton itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHopkinton runs about 219 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredHopkinton sits in USDA hardiness zone 6b.
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 Hopkinton is in
Hopkinton sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Hopkinton's own centroid rather than borrowed from Washington County.
What Grows in Hopkinton
Every plant below cleared Hopkinton's own zone 6b and its 219-day season. Each card opens that plant's Rhode Island profile. How we score.
Is it too late to plant in Hopkinton?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 31 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 5 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Hopkinton
Spotted lanternfly documented 17 miles from Hopkinton, first recorded 2021. What to watch for.
What's on the federal record near Hopkinton
Closest first, within ~10 miles of Hopkinton. Listing isn't leaking, and distance isn't exposure.
- HOPKINTON GENERAL STOREUnderground Storage Tanks · 2000 ft
- H.L. WOODMANSEE & SONUnderground Storage Tanks · 2500 ft
- NEW ENGLAND TELEPHONE COMPANYUnderground Storage Tanks · 2500 ft
- CHEVRON STATIONUnderground Storage Tanks · 2500 ft
- AMERICAN FISH CLUTURE COMPANYUnderground Storage Tanks · 0.7 mi
- PROSYSTEMS INTEGRATIONBrownfields · 0.7 mi
- HOPKINTON TOWN OF HIGHWAY DEPTBrownfields · 0.8 mi
- THOMPSON JAMES NATIVE LUMBERBrownfields · 0.8 mi
- THAMES RIVER TUBE CO., INC.Underground Storage Tanks · 1.6 mi
- DIV. OF FOREST ENV., ARCADIA HDQRTSUnderground Storage Tanks · 1.6 mi
- YAWGOOG SCOUT RESERVATIONUnderground Storage Tanks · 1.6 mi
- R I HARVESTING CO INCBrownfields · 1.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Hopkinton'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 Hopkinton.
Total Sites
660
within ~10 miles of Hopkinton
Risk Level
Elevated
Highest-severity
8 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Hopkinton
Severity Distribution
within ~10 miles of Hopkinton
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Hopkinton, Nitrate runs higher than the national average — 274 sites within ~10 miles of Hopkinton. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Hopkinton
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 Hopkinton average
Your land is one point inside Hopkinton
Everything above resolves to Hopkinton as a whole — one PHZM band and one 28°F frost record, read across 2K 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 town 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 Hopkinton Average
Hopkinton Average
- ●USDA Zones 6b, averaged across Hopkinton
- ●One soil character for all of Hopkinton
- ●Frost dates read at Hopkinton's scale: Mar 31 to Nov 5
YOUR Parcel
- ✓Your exact zone, not Hopkinton's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Hopkinton
Pull a site-specific report for your exact address in Hopkinton, Rhode Island — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Hopkinton averages can't show:
We read public map data around Hopkinton — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Hopkinton average
How we know this about Hopkinton
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Hopkinton’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 town grain anywhere on this page — there is no town-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 Hopkinton
When does frost risk typically end in Hopkinton?
The last hard freeze (28°F) in Hopkinton typically lands around Mar 31, 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 Apr 21.
When is the first frost in Hopkinton?
The first hard freeze (28°F) in Hopkinton typically arrives around Nov 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 22, so the watching starts about Oct 6 — about 219 days after the spring freeze cleared.
How long is the growing season in Hopkinton?
Measured between 28°F hard freezes, Hopkinton sees about 219 frost-free days — roughly Mar 31 through Nov 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 21 to Oct 22, about 184 days.
Is the soil safe to grow vegetables in Hopkinton?
The federal record around Hopkinton is a meaningful one — 660 documented sites, mostly Nitrate entries (274), the nearest Underground Storage Tanks record about 0.4 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Hopkinton?
From about Oct 6 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 Nov 5 (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 Nov 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Hopkinton's scale — its 6b band and its 219-day season. Your yard writes its own version of Hopkinton'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 Hopkinton’s own scale
7 of the readings below were taken at Hopkinton's own scale — its own ~219-day season between 28°F freezes, the 2,113 acres it covers and 660 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Hopkinton's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Hopkinton's own 28°F hard-freeze dates, about Mar 31 and Nov 5 and the ~219-day span between themNOAA 1991–2020 Climate Normals
- 660 documented contamination sites on the federal record near Hopkinton, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Hopkinton's boundary and the 2,113 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~219-day seasonGrowable Ground crop-matching engine
- The ecoregion at Hopkinton's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Hopkintonlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Hopkinton's 2,113 acres read through its county's SSURGO summaryfrom Washington County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Washington County
- The growing challenges every Rhode Island grower plans around — written at state scale, so they stay on the state guidefrom Rhode Island
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Washington County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Hopkinton's 2,113 acreswhy one lot differs from the next →
- Which side of Hopkinton you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,113 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Hopkinton-wide figureread your own land →
More in Rhode Island
Growing region
Nearby growing guides