When to plant in Ken Caryl, CO
USDA Zone 6aEverything below — frost dates, hardiness zone, and what to plant when in Ken Caryl, Colorado — is derived from the closest NOAA station with complete climate normals.
Zone 6a means Ken Caryl sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
MARSTON FLTR PLT · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Ken Caryl’s own odds, recorded at MARSTON FLTR PLT.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 29 | May 12 | Apr 30 | Sep 17 | Oct 2 | Oct 15 |
| 32°F | May 17 | May 2 | Apr 20 | Sep 27 | Oct 11 | Oct 23 |
| 28°F | May 7 | Apr 23 | Apr 8 | Oct 6 | Oct 21 | Nov 5 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Ken Caryl, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 16 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Ken Caryl planting FAQ
When is the last spring frost in Ken Caryl, CO?
On average, the last spring frost in Ken Caryl is around May 2 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Ken Caryl, CO?
In Ken Caryl, the first 32°F freeze of fall lands around October 11 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Ken Caryl in?
Ken Caryl is in USDA hardiness zone 6a. In zone 6a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Ken Caryl?
There are roughly 162 frost-free days in Ken Caryl (a moderate growing season), running from the average last frost around May 2 to the first fall frost near October 11.
When should I plant tomatoes in Ken Caryl?
In Ken Caryl, start tomato seeds indoors around March 7–March 21, then transplant seedlings outdoors around May 9 once the danger of frost has passed.
Never miss a window in Ken Caryl
An email when it’s time to start seeds, transplant, and sow — timed to Ken Caryl’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Columbine · 4 km
- Dakota Ridge · 5 km
- Littleton · 8 km
- Englewood · 13 km
- Highlands Ranch · 13 km
- Lakewood · 14 km
- Greenwood Village · 18 km
- Golden · 20 km
Frost dates recorded at MARSTON FLTR PLT, 6 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Ken Caryl, CO — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00055402. Retrieved from https://blissgarden.com/colorado/ken-caryl.