Riverdale, New Jersey, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Expect cabbage, hazelnut, california poppy, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Riverdale, 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 Riverdale 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 Riverdale — soil, climate, flood, and parcel records. How we handle your address.
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Riverdale — the short answer
Riverdale, New Jersey: USDA zone 7a, about 213 days between hard freezes, across 1K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~213
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 Riverdale's average, not your lot's — a low corner or a tree line moves it. Against Riverdale's 213-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Riverdale
Each reading below is measured for Riverdale itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRiverdale runs about 213 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
MeasuredRiverdale 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 Riverdale is in
Riverdale sits in the Northeastern Highlands — EPA Level III, inside the wider Northern Forests. That is read at Riverdale's own centroid rather than borrowed from Morris County.
What Grows in Riverdale
Every plant below cleared Riverdale's own zone 7a and its 213-day season. Each card opens that plant's New Jersey profile. How we score.
Is it too late to plant in Riverdale?
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 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 2 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Documented around Riverdale
Spotted lanternfly documented 2 miles from Riverdale, first recorded 2021. What to watch for.
What's on the federal record near Riverdale
Closest first, within ~10 miles of Riverdale. Listing isn't leaking, and distance isn't exposure.
- PEQUANNOCK TWP WATER DEPARTMENTPFAS · 0 ft
- TILCON NEW YORK INC.Toxics Release Inventory · 1300 ft
- RIVERDALE QUARRY COUnderground Storage Tanks · 1400 ft
- WALMART #3443Brownfields · 1700 ft
- ROUTE 287 TANKER SPILL RIVERDALE, NJSuperfund · 1700 ft
- HOME DEPOT INC #0919Brownfields · 1800 ft
- KEIL OIL INCUnderground Storage Tanks · 2000 ft
- BUTLER PLBG & HTG SUPPLY CO INCUnderground Storage Tanks · 2100 ft
- KEIL HEATING & AIR CONDITIONINGUnderground Storage Tanks · 2300 ft
- RIVERDALE CHEMICAL CORPUnderground Storage Tanks · 2500 ft
- A TO Z SERVICESUnderground Storage Tanks · 2500 ft
- RICHARDS FUNERAL HOME INCUnderground Storage Tanks · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Riverdale'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 Riverdale.
Sources Checked
within ~10 miles of Riverdale
Severity Distribution
within ~10 miles of Riverdale
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Riverdale, two things run higher than the national average within ~10 miles of Riverdale — Superfund (52 sites) and PFAS (25 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Riverdale
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 Riverdale average
Your land is one point inside Riverdale
Everything above resolves to Riverdale as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Riverdale Average
Riverdale Average
- ●USDA Zones 7a, averaged across Riverdale
- ●One soil character for all of Riverdale
- ●Frost dates read at Riverdale's scale: Apr 3 to Nov 2
YOUR Parcel
- ✓Your exact zone, not Riverdale's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Riverdale
Pull a site-specific report for your exact address in Riverdale, New Jersey — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Riverdale averages can't show:
We read public map data around Riverdale — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Riverdale average
How we know this about Riverdale
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 Riverdale’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 Riverdale
When does frost risk typically end in Riverdale?
The last hard freeze (28°F) in Riverdale typically lands around Apr 3, 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 24.
When is the first frost in Riverdale?
The first hard freeze (28°F) in Riverdale typically arrives around Nov 2, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 19, so the watching starts about Oct 3 — about 213 days after the spring freeze cleared.
How long is the growing season in Riverdale?
Measured between 28°F hard freezes, Riverdale sees about 213 frost-free days — roughly Apr 3 through Nov 2, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 24 to Oct 19, about 178 days.
Is the soil safe to grow vegetables in Riverdale?
The federal record around Riverdale runs heavier than most — 2,487 documented sites, mostly Underground Storage Tanks entries (1,429), the nearest PFAS record under a tenth of a mile 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 Riverdale?
From about Oct 3 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 2 (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 2. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Riverdale's scale — its 7a band and its 213-day season. Your yard writes its own version of Riverdale'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 Riverdale’s own scale
7 of the readings below were taken at Riverdale's own scale — its own ~213-day season between 28°F freezes, the 1,297 acres it covers and 2,487 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Riverdale's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Riverdale's own 28°F hard-freeze dates, about Apr 3 and Nov 2 and the ~213-day span between themNOAA 1991–2020 Climate Normals
- 2,487 documented contamination sites on the federal record near Riverdale, the closest PFAS record under a tenth of a mile out from the town centreFederal environmental registers
- Riverdale's boundary and the 1,297 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~213-day seasonGrowable Ground crop-matching engine
- The ecoregion at Riverdale's own centroid, the Northeastern HighlandsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Riverdalelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Riverdale's 1,297 acres read through its county's SSURGO summaryfrom Morris County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Morris County
- The growing challenges every New Jersey grower plans around — written at state scale, so they stay on the state guidefrom New Jersey
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Morris County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Riverdale's 1,297 acreswhy one lot differs from the next →
- Which side of Riverdale you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,297 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest PFAS record under a tenth of a mile 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 Riverdale-wide figureread your own land →