Colmar Manor, Maryland, sits in USDA hardiness zone 7b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
On paper, cabbage, prickly pear, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Colmar Manor, 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 Colmar Manor 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 Colmar Manor — soil, climate, flood, and parcel records. How we handle your address.
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Colmar Manor — the short answer
Colmar Manor, Maryland: USDA zone 7b, about 246 days between hard freezes, across 276 acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~246
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 276 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 7b is Colmar Manor's average, not your lot's — a low corner or a tree line moves it. Against Colmar Manor's 246-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Colmar Manor
Each reading below is measured for Colmar Manor itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredColmar Manor runs about 246 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
MeasuredColmar Manor sits in USDA hardiness zone 7b.
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 Colmar Manor is in
Colmar Manor sits in the Southeastern Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Colmar Manor's own centroid rather than borrowed from Prince George's County.
What Grows in Colmar Manor
Every plant below cleared Colmar Manor's own zone 7b and its 246-day season. Each card opens that plant's Maryland profile. How we score.
Is it too late to plant in Colmar Manor?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Feb 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 20 — 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 Colmar Manor
Spotted lanternfly documented 1 miles from Colmar Manor, first recorded 2021. What to watch for.
What's on the federal record near Colmar Manor
Closest first, within ~10 miles of Colmar Manor. Listing isn't leaking, and distance isn't exposure.
- Colmar Manor Elementary SchoolUnderground Storage Tanks · 2500 ft
- PREMIUM DISTRIBUTORS OF WASHINGTON DCBrownfields · 2500 ft
- WSSC ANACOSTIA ELECTRICAL/MECHANICAL SHOPBrownfields · 0.5 mi
- WSSC ANACOSTIA WAREHOUSEBrownfields · 0.5 mi
- ANACOSTIA BUILDINGS & GROUNDS SHEDBrownfields · 0.5 mi
- WSSC - ANACOSTIA EQUIPMENT SHOPBrownfields · 0.5 mi
- Anacostia Equipment ShopUnderground Storage Tanks · 0.5 mi
- Anacostia (F.M.D.)Underground Storage Tanks · 0.5 mi
- PETSMART #2452Brownfields · 0.6 mi
- DICK'S SPORTING GOODS #1276Brownfields · 0.6 mi
- Haass & Broyles Excavators, Inc.Underground Storage Tanks · 0.6 mi
- COSTCO WHOLESALE #1120Brownfields · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Colmar Manor'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 Colmar Manor.
Sources Checked
within ~10 miles of Colmar Manor
Severity Distribution
within ~10 miles of Colmar Manor
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Colmar Manor, Superfund runs higher than the national average — 75 sites within ~10 miles of Colmar Manor. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Colmar Manor
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 Colmar Manor average
Your land is one point inside Colmar Manor
Everything above resolves to Colmar Manor as a whole — one PHZM band and one 28°F frost record, read across 276 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 Colmar Manor Average
Colmar Manor Average
- ●USDA Zones 7b, averaged across Colmar Manor
- ●One soil character for all of Colmar Manor
- ●Frost dates read at Colmar Manor's scale: Mar 19 to Nov 20
YOUR Parcel
- ✓Your exact zone, not Colmar Manor's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Colmar Manor
Pull a site-specific report for your exact address in Colmar Manor, Maryland — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Colmar Manor averages can't show:
We read public map data around Colmar Manor — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Colmar Manor average
How we know this about Colmar Manor
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 Colmar Manor’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 Colmar Manor
When does frost risk typically end in Colmar Manor?
The last hard freeze (28°F) in Colmar Manor typically lands around Mar 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 Apr 9.
When is the first frost in Colmar Manor?
The first hard freeze (28°F) in Colmar Manor typically arrives around Nov 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 6, so the watching starts about Oct 21 — about 246 days after the spring freeze cleared.
How long is the growing season in Colmar Manor?
Measured between 28°F hard freezes, Colmar Manor sees about 246 frost-free days — roughly Mar 19 through Nov 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 9 to Nov 6, about 211 days.
Is the soil safe to grow vegetables in Colmar Manor?
The federal record around Colmar Manor runs heavier than most — 5,603 documented sites, mostly Underground Storage Tanks entries (2,991), the nearest Underground Storage Tanks record about 0.5 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 Colmar Manor?
From about Oct 21 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Colmar Manor's scale — its 7b band and its 246-day season. Your yard writes its own version of Colmar Manor'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 Colmar Manor’s own scale
7 of the readings below were taken at Colmar Manor's own scale — its own ~246-day season between 28°F freezes, the 276 acres it covers and 5,603 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Colmar Manor's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Colmar Manor's own 28°F hard-freeze dates, about Mar 19 and Nov 20 and the ~246-day span between themNOAA 1991–2020 Climate Normals
- 5,603 documented contamination sites on the federal record near Colmar Manor, the closest Underground Storage Tanks record about 0.5 miles out from the town centreFederal environmental registers
- Colmar Manor's boundary and the 276 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~246-day seasonGrowable Ground crop-matching engine
- The ecoregion at Colmar Manor's own centroid, the Southeastern PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Colmar Manorlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Colmar Manor's 276 acres read through its county's SSURGO summaryfrom Prince George's County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Prince George's County
- The growing challenges every Maryland grower plans around — written at state scale, so they stay on the state guidefrom Maryland
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Prince George's County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Colmar Manor's 276 acreswhy one lot differs from the next →
- Which side of Colmar Manor you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 276 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Colmar Manor-wide figureread your own land →
More in Maryland
Wider growing context
What grows across MarylandColmar Manor sits outside our named growing regions, so Maryland as a whole is its closest context here.
Nearby growing guides