Chaffee County, in Colorado, sits in USDA hardiness zone 5a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
A short list that earns its place here — pumpkin, blackberry, lavender, and zucchini — with any one site's soil, sun, and drainage making the final cut.
Chaffee County lies within the Colorado High Country (Central Rockies) — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Chaffee County holds more than one microclimate.
Soils and elevations shift across Chaffee County, so your frost dates and drainage aren't the county average. 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 Chaffee County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Chaffee County — the short answer
Chaffee County, Colorado: USDA zone 5a, about 85 days between hard freezes, across 649K acres.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jun 12
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Sep 5
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~85
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 649K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 Chaffee County's average, not your lot's — a low corner or a tree line moves it. Against Chaffee County's 85-day season, see what your own ground reads.
Heat in Chaffee County
Across a year, Chaffee County accumulates about 31 growing degree days above 50°F, about 1,801 fewer than the middle Colorado county — no other Colorado county banks fewer. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Chaffee County
Across Chaffee County, the ground is predominantly Mollisols, where Dominson, Leadville, and St. Elmo are the most extensive named soil series. The soil is generally well drained with a gravelly sandy loam surface. Topsoil pH runs about 7.0–7.6, neutral. Rainfall drains through hydrologic group A soils.
Soil order
Mollisols
Drainage
Well drained
Hydric soils
11%
Soil still varies lot by lot — soil types explained.
How the ground varies across Chaffee County
The USDA soil survey maps 37% of Chaffee County as well drained — but another 36% drains differently: 19% somewhat excessively drained, 8% poorly drained.
Dominson is the most extensive named soil at 20% of mapped acres, then Leadville (5%) and St. Elmo (5%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Chaffee County
Each reading below is measured for Chaffee County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Chaffee County are well drained, in hydrologic group A — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Chaffee County runs about pH 7.0–7.6, close to neutral.
This is the range most vegetables prefer — one correction you probably do not have to make, which is genuinely good news for a new bed.
Keep it there with compost rather than lime or sulfur, and only amend if your own soil test says otherwise.
USDA NRCS SSURGO
Season length
MeasuredChaffee County runs about 85 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
MeasuredChaffee County 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 Chaffee County is in
Chaffee County sits in the Southern Rockies — EPA Level III, inside the wider Northwestern Forested Mountains. One consistent ecological setting across the whole county.
What Grows in Chaffee County
We scored all 1,086 plants against Chaffee County's own USDA zone 5a and its own 85-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Colorado profile.
Is it too late to plant in Chaffee County?
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 May 15; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jun 12 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 5 — 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.
Documented around Chaffee County
- monarch butterfly4 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Chaffee County
USGS estimates 3,202 lb of Glyphosate on Chaffee County farmland in 2019, its largest by weight, ahead of Metolachlor-s (2,899 lb) and Metolachlor & Metolachlor-s (2,899 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Chaffee County — and how to grow with it.
We checked the federal record across Chaffee County — 353 documented sites across 7 of the 9 source types we track.
The most significant on record: 6 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Chaffee County carries one of the heavier federal records we track — and that's not a verdict on your yard. Proximity to a documented site is information, not a diagnosis: nothing here says any particular parcel is affected. It does earn one concrete step — before food beds go in the ground, a professional soil test tells you exactly what you're working with, and raised beds with clean imported soil grow well almost anywhere in the meantime.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Chaffee County
Closest first, across Chaffee County. Listing isn't leaking, and distance isn't exposure.
- Elmer McmurrayMining · 1.5 mi
- DumpiteMining · 1.5 mi
- High LonesomeUnderground Storage Tanks · 2.0 mi
- Mound MineMining · 3.5 mi
- RollaMining · 3.6 mi
- Carey MillMining · 3.6 mi
- Forward Gold MiningMining · 3.6 mi
- Ole BullMining · 3.6 mi
- Black HawkMining · 3.6 mi
- Colorado Gold MiningMining · 3.6 mi
- Maple LeafMining · 3.6 mi
- ParakeetMining · 4.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Chaffee County'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 Chaffee County.
Sources Checked
across Chaffee County
Severity Distribution
across Chaffee County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Chaffee County, two things run higher than the national average across Chaffee County — Mining (168 sites) and Superfund (6 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 Chaffee County
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 Chaffee County average
Your land is one point inside Chaffee County
Everything above resolves to Chaffee County as a whole — one PHZM band and one county frost record, read across 649K 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 county 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 county average.
Your Lot vs the Chaffee County Average
Chaffee County Average
- ●USDA Zones 5a, averaged across Chaffee County
- ●One soil character for all of Chaffee County
- ●Frost dates read at Chaffee County's scale: Jun 12 to Sep 5
YOUR Parcel
- ✓Your exact zone, not Chaffee County's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Chaffee County
Pull a site-specific report for your exact address in Chaffee County, Colorado — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Chaffee County averages can't show:
We read public map data around Chaffee County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Chaffee County average
How we know this about Chaffee County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Chaffee County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Chaffee County
When does frost risk typically end in Chaffee County?
The last hard freeze (28°F) in Chaffee County typically lands around Jun 12, 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 Jul 3.
How long is the growing season in Chaffee County?
Measured between 28°F hard freezes, Chaffee County sees about 85 frost-free days — roughly Jun 12 through Sep 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jul 3 to Aug 22, about 50 days.
Is the soil safe to grow vegetables in Chaffee County?
The federal record around Chaffee County runs heavier than most — 353 documented sites, mostly Mining entries (168), the nearest Mining record about 1.5 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 gardeners stretch the season in Chaffee County?
With about 85 frost-free days between hard freezes, Chaffee County 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 113 to 141 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the Jun 12 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Chaffee County's scale — its 5a band and its 85-day season. Your yard writes its own version of Chaffee County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Colorado's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Chaffee County’s own scale
9 of the readings below were taken at Chaffee County's own scale — its own ~85-day span between 28°F freezes, the 3 most extensive soil series mapped here and 353 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Chaffee County's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Chaffee County's own 28°F hard-freeze dates and its ~85-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Chaffee CountyUSDA NRCS SSURGO
- 353 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Mining record about 1.5 miles outFederal environmental registers
- Chaffee County's boundary and the 648,581 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~85-day seasonGrowable Ground crop-matching engine
- Chaffee County sitting wholly inside the Southern RockiesUS EPA Level III Ecoregions
- Open occurrence records documented in Chaffee County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Chaffee County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Colorado grower plans around — written at state scale, so they stay on the state guidefrom Colorado
What this page can’t tell you
- How the season shifts across Chaffee County — the ~85 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Chaffee County's 648,581 acreswhy one lot differs from the next →
- Which of those 353 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Chaffee Countyread your own land →