When to plant in Glenwood Springs, CO
USDA Zone 6aEverything below — frost dates, hardiness zone, and what to plant when in Glenwood Springs, Colorado — is derived from the closest NOAA station with complete climate normals.
In zone 6a, Glenwood Springs gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
GLENWOOD SPGS #2 · 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 Glenwood Springs’s own odds, recorded at GLENWOOD SPGS #2.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 13 | May 30 | May 16 | Sep 10 | Sep 23 | Oct 4 |
| 32°F | May 30 | May 13 | Apr 30 | Sep 20 | Oct 3 | Oct 15 |
| 28°F | May 11 | Apr 27 | Apr 14 | Sep 29 | Oct 14 | Oct 27 |
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 Glenwood Springs, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 33 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.
Glenwood Springs planting FAQ
When is the last spring frost in Glenwood Springs, CO?
On average, the last spring frost in Glenwood Springs is around May 13 (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 Glenwood Springs, CO?
In Glenwood Springs, the first 32°F freeze of fall lands around October 3 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Glenwood Springs in?
Glenwood Springs 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 Glenwood Springs?
Glenwood Springs has about 143 frost-free days — a short growing season — between the average last spring frost (May 13) and first fall frost (October 3).
When should I plant tomatoes in Glenwood Springs?
For Glenwood Springs, sow tomatoes indoors about March 18–April 1 and move the seedlings out around May 20, after the last spring frost.
Never miss a window in Glenwood Springs
An email when it’s time to start seeds, transplant, and sow — timed to Glenwood Springs’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Rifle · 37 km
- Edwards · 62 km
- Clifton · 109 km
- Steamboat Springs · 112 km
- Grand Junction · 117 km
- Fruita · 127 km
- Montrose · 128 km
- Golden · 184 km
Frost dates recorded at GLENWOOD SPGS #2, 4 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 Glenwood Springs, CO — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00053359. Retrieved from https://blissgarden.com/colorado/glenwood-springs.