Poplar Plains, Connecticut, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
The conditions favor cabbage, hazelnut, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Poplar Plains, 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 Poplar Plains 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 Poplar Plains — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Poplar Plains — the short answer
Poplar Plains, Connecticut: USDA zone 7a, about 225 days between hard freezes, across 684 acres of town.
- USDA zone
- 7a
- 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 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~225
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 684 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 7a is Poplar Plains's average, not your lot's — a low corner or a tree line moves it. Against Poplar Plains's 225-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Poplar Plains
Each reading below is measured for Poplar Plains itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredPoplar Plains runs about 225 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
MeasuredPoplar Plains sits in USDA hardiness zone 7a.
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 Poplar Plains is in
Poplar Plains sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Poplar Plains's own centroid rather than borrowed from Western Connecticut Planning Region.
What Grows in Poplar Plains
Every plant below cleared Poplar Plains's own zone 7a and its 225-day season. Each card opens that plant's Connecticut profile. How we score.
Is it too late to plant in Poplar Plains?
Almost never — the real question is what to plant next. 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 11 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Poplar Plains
Spotted lanternfly documented 2 miles from Poplar Plains, first recorded 2021. What to watch for.
What's on the federal record near Poplar Plains
Closest first, within ~10 miles of Poplar Plains. Listing isn't leaking, and distance isn't exposure.
- WESTON WESPORT FAMILY YMCABrownfields · 0.5 mi
- DOT CT STATE OFBrownfields · 0.7 mi
- CT-WP 33Nitrate · 0.7 mi
- CT-WP 38Nitrate · 0.9 mi
- 19 NEWTOWN TURNPIKEUnderground Storage Tanks · 0.9 mi
- AQUARION WATERBrownfields · 1.0 mi
- AQUARION WATER CO OF CTBrownfields · 1.0 mi
- CT-WP 21Nitrate · 1.0 mi
- IMAGE WORKSBrownfields · 1.1 mi
- CT-WP 11Nitrate · 1.4 mi
- CT-WP 10Nitrate · 1.4 mi
- CT-WP 12Nitrate · 1.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Poplar Plains'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 Poplar Plains.
Total Sites
1,554
within ~10 miles of Poplar Plains
Risk Level
Elevated
Highest-severity
17 Superfund sites
Sources Checked
within ~10 miles of Poplar Plains
Severity Distribution
within ~10 miles of Poplar Plains
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Poplar Plains
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 Poplar Plains average
Your land is one point inside Poplar Plains
Everything above resolves to Poplar Plains as a whole — one PHZM band and one 28°F frost record, read across 684 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 Poplar Plains Average
Poplar Plains Average
- ●USDA Zones 7a, averaged across Poplar Plains
- ●One soil character for all of Poplar Plains
- ●Frost dates read at Poplar Plains's scale: Mar 31 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Poplar Plains's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Poplar Plains
Pull a site-specific report for your exact address in Poplar Plains, Connecticut — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Poplar Plains averages can't show:
We read public map data around Poplar Plains — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Poplar Plains average
How we know this about Poplar Plains
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 Poplar Plains’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 Poplar Plains
When does frost risk typically end in Poplar Plains?
The last hard freeze (28°F) in Poplar Plains 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 Poplar Plains?
The first hard freeze (28°F) in Poplar Plains typically arrives around Nov 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 28, so the watching starts about Oct 12 — about 225 days after the spring freeze cleared.
How long is the growing season in Poplar Plains?
Measured between 28°F hard freezes, Poplar Plains sees about 225 frost-free days — roughly Mar 31 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 21 to Oct 28, about 190 days.
Is the soil safe to grow vegetables in Poplar Plains?
The federal record around Poplar Plains is a meaningful one — 1,554 documented sites, mostly Underground Storage Tanks entries (829), the nearest Brownfields record about 0.5 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 Poplar Plains?
From about Oct 12 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Poplar Plains's scale — its 7a band and its 225-day season. Your yard writes its own version of Poplar Plains'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 Poplar Plains’s own scale
7 of the readings below were taken at Poplar Plains's own scale — its own ~225-day season between 28°F freezes, the 684 acres it covers and 1,554 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Poplar Plains's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Poplar Plains's own 28°F hard-freeze dates, about Mar 31 and Nov 11 and the ~225-day span between themNOAA 1991–2020 Climate Normals
- 1,554 documented contamination sites on the federal record near Poplar Plains, the closest Brownfields record about 0.5 miles out from the town centreFederal environmental registers
- Poplar Plains's boundary and the 684 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~225-day seasonGrowable Ground crop-matching engine
- The ecoregion at Poplar Plains's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Poplar Plainslydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Poplar Plains's 684 acres read through its county's SSURGO summaryfrom Western Connecticut County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Western Connecticut County
- The growing challenges every Connecticut grower plans around — written at state scale, so they stay on the state guidefrom Connecticut
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Western Connecticut County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Poplar Plains's 684 acreswhy one lot differs from the next →
- Which side of Poplar Plains you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 684 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.5 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 Poplar Plains-wide figureread your own land →
More in Connecticut
Wider growing context
What grows across ConnecticutPoplar Plains sits outside our named growing regions, so Connecticut as a whole is its closest context here.
Nearby growing guides