Kremmling, Colorado, sits in USDA hardiness zone 4a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Crops well matched to these conditions include okra, cranberry, cilantro, and zucchini — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Kremmling, 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 Kremmling 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 Kremmling — soil, climate, flood, and parcel records. How we handle your address.
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Kremmling — the short answer
Kremmling, Colorado: USDA zone 4a, about 119 days between hard freezes, across 838 acres of town.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~119
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 838 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 4a is Kremmling's average, not your lot's — a low corner or a tree line moves it. Against Kremmling's 119-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Kremmling
Each reading below is measured for Kremmling itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredKremmling runs about 119 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
MeasuredKremmling sits in USDA hardiness zone 4a.
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 Kremmling is in
Kremmling sits in the Southern Rockies — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Kremmling's own centroid rather than borrowed from Grand County.
What Grows in Kremmling
Every plant below cleared Kremmling's own zone 4a and its 119-day season. Each card opens that plant's Colorado profile. How we score.
Is it too late to plant in Kremmling?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Apr 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 23 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 19 — 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 Kremmling
Closest first, within ~10 miles of Kremmling. Listing isn't leaking, and distance isn't exposure.
- Grand Fuel DepotUnderground Storage Tanks · 1000 ft
- Pepsi-cola Bottling CoUnderground Storage Tanks · 1400 ft
- Grand County Road & Bridge - #4Underground Storage Tanks · 1700 ft
- FEDERAL EXPRESS - ZKRMBrownfields · 1900 ft
- Louisiana-Pacific/KremmlingUnderground Storage Tanks · 2000 ft
- Kremmling Airport McElroy Field Alpine WingsUnderground Storage Tanks · 2000 ft
- Andrew Smith PropertyUnderground Storage Tanks · 2100 ft
- FAMILY DOLLAR #10520Brownfields · 2100 ft
- BLM KREMMLING FIELD OFFICEBrownfields · 2400 ft
- Kum & Go #909Underground Storage Tanks · 0.5 mi
- Bob's 66 ServiceUnderground Storage Tanks · 0.6 mi
- Kremmling Vor/den056Underground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Kremmling'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 Kremmling.
Total Sites
40
within ~10 miles of Kremmling
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Kremmling
Severity Distribution
within ~10 miles of Kremmling
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Kremmling, two things run higher than the national average within ~10 miles of Kremmling — Mining (5 sites) and Underground Storage Tanks (26 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Kremmling
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 Kremmling average
Your land is one point inside Kremmling
Everything above resolves to Kremmling as a whole — one PHZM band and one 28°F frost record, read across 838 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 Kremmling Average
Kremmling Average
- ●USDA Zones 4a, averaged across Kremmling
- ●One soil character for all of Kremmling
- ●Frost dates read at Kremmling's scale: May 23 to Sep 19
YOUR Parcel
- ✓Your exact zone, not Kremmling's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Kremmling
Pull a site-specific report for your exact address in Kremmling, Colorado — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Kremmling averages can't show:
We read public map data around Kremmling — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Kremmling average
How we know this about Kremmling
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 Kremmling’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 Kremmling
When does frost risk typically end in Kremmling?
The last hard freeze (28°F) in Kremmling typically lands around May 23, 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 13.
When is the first frost in Kremmling?
The first hard freeze (28°F) in Kremmling typically arrives around Sep 19, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 5, so the watching starts about Aug 20 — about 119 days after the spring freeze cleared.
How long is the growing season in Kremmling?
Measured between 28°F hard freezes, Kremmling sees about 119 frost-free days — roughly May 23 through Sep 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 13 to Sep 5, about 84 days.
Is the soil safe to grow vegetables in Kremmling?
The federal record around Kremmling is a meaningful one — 40 documented sites, mostly Underground Storage Tanks entries (26), the nearest Underground Storage Tanks record about 0.2 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do gardeners stretch the season in Kremmling?
With about 119 frost-free days between hard freezes, Kremmling 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 147 to 175 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 23 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Kremmling's scale — its 4a band and its 119-day season. Your yard writes its own version of Kremmling'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 Kremmling’s own scale
6 of the readings below were taken at Kremmling's own scale — its own ~119-day season between 28°F freezes, the 838 acres it covers and 40 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Kremmling's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Kremmling's own 28°F hard-freeze dates, about May 23 and Sep 19 and the ~119-day span between themNOAA 1991–2020 Climate Normals
- 40 documented contamination sites on the federal record near Kremmling, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Kremmling's boundary and the 838 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~119-day seasonGrowable Ground crop-matching engine
- The ecoregion at Kremmling's own centroid, the Southern RockiesUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Kremmling's 838 acres read through its county's SSURGO summaryfrom Grand County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Grand 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 Grand County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Kremmling's 838 acreswhy one lot differs from the next →
- Which side of Kremmling you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 838 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 Kremmling-wide figureread your own land →