When to plant in Grand Junction, CO
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in Grand Junction, Colorado — is derived from the closest NOAA station with complete climate normals.
In zone 7a, Grand Junction supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
GRAND JUNCTION WFO · 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 Grand Junction’s own odds, recorded at GRAND JUNCTION WFO.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 9 | Apr 25 | Apr 12 | Oct 3 | Oct 14 | Oct 26 |
| 32°F | Apr 28 | Apr 14 | Apr 1 | Oct 11 | Oct 23 | Nov 6 |
| 28°F | Apr 18 | Apr 2 | Mar 12 | Oct 19 | Nov 2 | Nov 15 |
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 Grand Junction, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 10 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.
Grand Junction planting FAQ
When is the last spring frost in Grand Junction, CO?
On average, the last spring frost in Grand Junction is around April 14 (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 Grand Junction, CO?
Expect Grand Junction's first fall frost near October 23 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Grand Junction in?
Grand Junction is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Grand Junction?
Grand Junction has about 192 frost-free days — a moderate growing season — between the average last spring frost (April 14) and first fall frost (October 23).
When should I plant tomatoes in Grand Junction?
For Grand Junction, sow tomatoes indoors about February 17–March 3 and move the seedlings out around April 21, after the last spring frost.
Never miss a window in Grand Junction
An email when it’s time to start seeds, transplant, and sow — timed to Grand Junction’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at GRAND JUNCTION WFO, 5 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 Grand Junction, CO — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00053486. Retrieved from https://blissgarden.com/colorado/grand-junction.