Seven Hills, Colorado, sits in USDA hardiness zone 6a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Among the crops suited to this profile: cabbage, blackberry, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Seven Hills, 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 Seven Hills 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 Seven Hills — soil, climate, flood, and parcel records. How we handle your address.
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Seven Hills — the short answer
Seven Hills, Colorado: USDA zone 6a, about 170 days between hard freezes, across 313 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~170
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 313 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 6a is Seven Hills's average, not your lot's — a low corner or a tree line moves it. Against Seven Hills's 170-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Seven Hills
Each reading below is measured for Seven Hills itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSeven Hills runs about 170 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredSeven Hills sits in USDA hardiness zone 6a.
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 Seven Hills is in
Seven Hills sits in the Southern Rockies — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Seven Hills's own centroid rather than borrowed from Boulder County.
What Grows in Seven Hills
Every plant below cleared Seven Hills's own zone 6a and its 170-day season. Each card opens that plant's Colorado profile. How we score.
Is it too late to plant in Seven Hills?
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 Apr 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 29 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 16 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Seven Hills
Closest first, within ~10 miles of Seven Hills. Listing isn't leaking, and distance isn't exposure.
- Poormans ReliefMining · 2400 ft
- SB00107127DBCA SITE C51Nitrate · 1.0 mi
- SB00107127DBCD SITE C55Nitrate · 1.0 mi
- XLN - 18Nitrate · 1.6 mi
- SB00107133BACB SITE 004Nitrate · 1.8 mi
- SB00107128CCBC SITE 003Nitrate · 1.8 mi
- Alaska TunnelMining · 1.8 mi
- PORE WATER AT 06727000Nitrate · 1.9 mi
- SC00407120CABANitrate · 1.9 mi
- SB00107133BDDA SITE 002Nitrate · 1.9 mi
- MAPLETON CENTER FOR REHABILITATIONBrownfields · 2.2 mi
- SB00107111CADB SITE C86Nitrate · 2.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Seven Hills'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 Seven Hills.
Sources Checked
within ~10 miles of Seven Hills
Severity Distribution
within ~10 miles of Seven Hills
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Seven Hills, two things run higher than the national average within ~10 miles of Seven Hills — Mining (85 sites) and Superfund (13 sites). That's not a problem with your land — it's information about it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Seven Hills
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 Seven Hills average
Your land is one point inside Seven Hills
Everything above resolves to Seven Hills as a whole — one PHZM band and one 28°F frost record, read across 313 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 Seven Hills Average
Seven Hills Average
- ●USDA Zones 6a, averaged across Seven Hills
- ●One soil character for all of Seven Hills
- ●Frost dates read at Seven Hills's scale: Apr 29 to Oct 16
YOUR Parcel
- ✓Your exact zone, not Seven Hills's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Seven Hills
Pull a site-specific report for your exact address in Seven Hills, Colorado — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Seven Hills averages can't show:
We read public map data around Seven Hills — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Seven Hills average
How we know this about Seven Hills
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 Seven Hills’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 Seven Hills
When does frost risk typically end in Seven Hills?
The last hard freeze (28°F) in Seven Hills typically lands around Apr 29, 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 May 20.
When is the first frost in Seven Hills?
The first hard freeze (28°F) in Seven Hills typically arrives around Oct 16, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 2, so the watching starts about Sep 16 — about 170 days after the spring freeze cleared.
How long is the growing season in Seven Hills?
Measured between 28°F hard freezes, Seven Hills sees about 170 frost-free days — roughly Apr 29 through Oct 16, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 20 to Oct 2, about 135 days.
Is the soil safe to grow vegetables in Seven Hills?
The federal record around Seven Hills runs heavier than most — 699 documented sites, mostly Underground Storage Tanks entries (219), the nearest Mining 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 Seven Hills?
From about Sep 16 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 Oct 16 (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 Oct 16. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Seven Hills's scale — its 6a band and its 170-day season. Your yard writes its own version of Seven Hills'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 Seven Hills’s own scale
6 of the readings below were taken at Seven Hills's own scale — its own ~170-day season between 28°F freezes, the 313 acres it covers and 699 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Seven Hills's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Seven Hills's own 28°F hard-freeze dates, about Apr 29 and Oct 16 and the ~170-day span between themNOAA 1991–2020 Climate Normals
- 699 documented contamination sites on the federal record near Seven Hills, the closest Mining record about 0.5 miles out from the town centreFederal environmental registers
- Seven Hills's boundary and the 313 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~170-day seasonGrowable Ground crop-matching engine
- The ecoregion at Seven Hills's own centroid, the Southern RockiesUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Seven Hills's 313 acres read through its county's SSURGO summaryfrom Boulder County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Boulder County
- The growing challenges every Colorado grower plans around — written at state scale, so they stay on the state guidefrom Colorado
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Boulder County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Seven Hills's 313 acreswhy one lot differs from the next →
- Which side of Seven Hills you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 313 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Mining 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 Seven Hills-wide figureread your own land →
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