Romeo, Colorado, sits in USDA hardiness zone 5a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
A short list that earns its place here — cabbage, cranberry, lavender, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Romeo, 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 Romeo 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 Romeo — soil, climate, flood, and parcel records. How we handle your address.
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Romeo — the short answer
Romeo, Colorado: USDA zone 5a, about 137 days between hard freezes, across 149 acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~137
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 149 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 5a is Romeo's average, not your lot's — a low corner or a tree line moves it. Against Romeo's 137-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Romeo
Each reading below is measured for Romeo itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRomeo runs about 137 days between hard freezes — a short growing season.
Long-maturing crops like melons, sweet potatoes, and winter squash can run out of runway before the first hard freeze, ripening late or not at all.
Lead with fast-maturing varieties, and stretch the season on both ends with cold frames, low tunnels, or a greenhouse.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredRomeo sits in USDA hardiness zone 5a.
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 Romeo is in
Romeo sits in the Arizona/New Mexico Plateau — EPA Level III, inside the wider North American Deserts. That is read at Romeo's own centroid rather than borrowed from Conejos County.
What Grows in Romeo
Every plant below cleared Romeo's own zone 5a and its 137-day season. Each card opens that plant's Colorado profile. How we score.
Is it too late to plant in Romeo?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Apr 18; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 30 — long-season crops need about 90 days of runway, quick greens only 30. In a season this compact, fast finishers and cold-hardy greens do the late work, and garlic tucked in before the freeze repays you next summer.
What's on the federal record near Romeo
Closest first, within ~10 miles of Romeo. Listing isn't leaking, and distance isn't exposure.
- Romeo ServiceUnderground Storage Tanks · 950 ft
- TMC INCBrownfields · 0.8 mi
- NA03400929CBB3Nitrate · 2.0 mi
- NA03400929CBB6Nitrate · 2.0 mi
- NA03400929CBB5Nitrate · 2.0 mi
- NA03400929CBB4Nitrate · 2.0 mi
- NA03400929CBB2Nitrate · 2.0 mi
- NA03300904BBANitrate · 2.5 mi
- CDOT ManassaUnderground Storage Tanks · 2.5 mi
- Manassa ElementaryUnderground Storage Tanks · 2.6 mi
- NA03400924ABCNitrate · 2.7 mi
- NA03500934DCCNitrate · 3.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Romeo'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 Romeo.
Total Sites
55
within ~10 miles of Romeo
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Romeo
Severity Distribution
within ~10 miles of Romeo
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Romeo, Nitrate runs higher than the national average — 20 sites within ~10 miles of Romeo. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Romeo
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 Romeo average
Your land is one point inside Romeo
Everything above resolves to Romeo as a whole — one PHZM band and one 28°F frost record, read across 149 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 Romeo Average
Romeo Average
- ●USDA Zones 5a, averaged across Romeo
- ●One soil character for all of Romeo
- ●Frost dates read at Romeo's scale: May 16 to Sep 30
YOUR Parcel
- ✓Your exact zone, not Romeo's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Romeo
Pull a site-specific report for your exact address in Romeo, Colorado — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Romeo averages can't show:
We read public map data around Romeo — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Romeo average
How we know this about Romeo
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 Romeo’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 Romeo
When does frost risk typically end in Romeo?
The last hard freeze (28°F) in Romeo typically lands around May 16, 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 Jun 6.
When is the first frost in Romeo?
The first hard freeze (28°F) in Romeo typically arrives around Sep 30, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 16, so the watching starts about Aug 31 — about 137 days after the spring freeze cleared.
How long is the growing season in Romeo?
Measured between 28°F hard freezes, Romeo sees about 137 frost-free days — roughly May 16 through Sep 30, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 6 to Sep 16, about 102 days.
Is the soil safe to grow vegetables in Romeo?
The federal record around Romeo shows 55 documented sites, mostly Underground Storage Tanks entries (28), the nearest Underground Storage Tanks record about 0.2 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do gardeners stretch the season in Romeo?
With about 137 frost-free days between hard freezes, Romeo rewards the classic extension moves: floating row cover buys roughly two to four extra weeks at each shoulder — on this season that is a working window nearer 165 to 193 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 16 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Romeo's scale — its 5a band and its 137-day season. Your yard writes its own version of Romeo'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 Romeo’s own scale
6 of the readings below were taken at Romeo's own scale — its own ~137-day season between 28°F freezes, the 149 acres it covers and 55 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Romeo's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Romeo's own 28°F hard-freeze dates, about May 16 and Sep 30 and the ~137-day span between themNOAA 1991–2020 Climate Normals
- 55 documented contamination sites on the federal record near Romeo, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Romeo's boundary and the 149 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~137-day seasonGrowable Ground crop-matching engine
- The ecoregion at Romeo's own centroid, the Arizona/New Mexico PlateauUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Romeo's 149 acres read through its county's SSURGO summaryfrom Conejos County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Conejos 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 Conejos County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Romeo's 149 acreswhy one lot differs from the next →
- Which side of Romeo you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 149 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 Romeo-wide figureread your own land →
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