Ambler, Pennsylvania, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
On paper, cabbage, hazelnut, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Ambler, 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 Ambler 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 Ambler — soil, climate, flood, and parcel records. How we handle your address.
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Ambler — the short answer
Ambler, Pennsylvania: USDA zone 7a, about 227 days between hard freezes, across 545 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 12
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~227
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 545 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 Ambler's average, not your lot's — a low corner or a tree line moves it. Against Ambler's 227-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Ambler
Each reading below is measured for Ambler itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAmbler runs about 227 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
MeasuredAmbler 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 Ambler is in
Ambler sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Ambler's own centroid rather than borrowed from Montgomery County.
What Grows in Ambler
Every plant below cleared Ambler's own zone 7a and its 227-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Ambler?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 12 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
Documented around Ambler
Spotted lanternfly documented 3 miles from Ambler, first recorded 2018. What to watch for.
What's on the federal record near Ambler
Closest first, within ~10 miles of Ambler. Listing isn't leaking, and distance isn't exposure.
- AMBLER CTL OFCUnderground Storage Tanks · 850 ft
- AMBLER BORO MUNI GARAGEUnderground Storage Tanks · 1000 ft
- RIDGE AUTO PARTS STOREBrownfields · 1000 ft
- AMBLER BEVERAGE COUnderground Storage Tanks · 1000 ft
- J LASZLO METAL WORK INCUnderground Storage Tanks · 1000 ft
- BROAD AXE & LINDENWOLD CLNR SVCBrownfields · 1000 ft
- JACK LYNCHUnderground Storage Tanks · 1000 ft
- CVS PHARMACY #8498Brownfields · 1200 ft
- R & J AUTO BODY LTDBrownfields · 1200 ft
- HOPEWELL CONSTUnderground Storage Tanks · 1300 ft
- MATTISON AVENUE ELEM SCHUnderground Storage Tanks · 1300 ft
- SHAEFF MYERS FUNERAL HOMEUnderground Storage Tanks · 1500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Ambler'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 Ambler.
Sources Checked
within ~10 miles of Ambler
Severity Distribution
within ~10 miles of Ambler
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 Ambler
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 Ambler average
Your land is one point inside Ambler
Everything above resolves to Ambler as a whole — one PHZM band and one 28°F frost record, read across 545 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 Ambler Average
Ambler Average
- ●USDA Zones 7a, averaged across Ambler
- ●One soil character for all of Ambler
- ●Frost dates read at Ambler's scale: Mar 30 to Nov 12
YOUR Parcel
- ✓Your exact zone, not Ambler's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Ambler
Pull a site-specific report for your exact address in Ambler, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Ambler averages can't show:
We read public map data around Ambler — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Ambler average
How we know this about Ambler
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 Ambler’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 Ambler
When does frost risk typically end in Ambler?
The last hard freeze (28°F) in Ambler typically lands around Mar 30, 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 20.
When is the first frost in Ambler?
The first hard freeze (28°F) in Ambler typically arrives around Nov 12, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 29, so the watching starts about Oct 13 — about 227 days after the spring freeze cleared.
How long is the growing season in Ambler?
Measured between 28°F hard freezes, Ambler sees about 227 frost-free days — roughly Mar 30 through Nov 12, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 20 to Oct 29, about 192 days.
Is the soil safe to grow vegetables in Ambler?
The federal record around Ambler runs heavier than most — 3,432 documented sites, mostly Underground Storage Tanks entries (1,762), the nearest Underground Storage Tanks 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 Ambler?
From about Oct 13 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 12 (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 12. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Ambler's scale — its 7a band and its 227-day season. Your yard writes its own version of Ambler'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 Ambler’s own scale
7 of the readings below were taken at Ambler's own scale — its own ~227-day season between 28°F freezes, the 545 acres it covers and 3,432 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Ambler's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Ambler's own 28°F hard-freeze dates, about Mar 30 and Nov 12 and the ~227-day span between themNOAA 1991–2020 Climate Normals
- 3,432 documented contamination sites on the federal record near Ambler, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Ambler's boundary and the 545 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~227-day seasonGrowable Ground crop-matching engine
- The ecoregion at Ambler's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Amblerlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Ambler's 545 acres read through its county's SSURGO summaryfrom Montgomery County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Montgomery County
- The growing challenges every Pennsylvania grower plans around — written at state scale, so they stay on the state guidefrom Pennsylvania
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Montgomery County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Ambler's 545 acreswhy one lot differs from the next →
- Which side of Ambler you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 545 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Ambler-wide figureread your own land →
More in Pennsylvania
Wider growing context
What grows across PennsylvaniaAmbler sits outside our named growing regions, so Pennsylvania as a whole is its closest context here.
Nearby growing guides