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When to plant crocuses in Grand Junction: 27 September – 7 December

In Grand Junction, crocus: plant from 27 September to about 7 December. For planting stock, the places nearby include West Elk Supply (farm supply, 2 km) and Bookcliff Gardens (garden centre, 3 km); addresses and opening hours are below.

Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

The date is about two weeks before the average daily temperature here falls below 0 °C (ten years of weather): an estimate, not the day the ground freezes, and a cold spell can freeze it earlier. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS, how the ground freezes (NRC Canada, CBD-26).

Crocus in Grand Junction: soil, season and weather

Nights then average below 0 °C in December–February; the coldest, January, averages -6.3 °C.

Planting27 September – 7 December
First autumn frost27 October
Coldest nightsJanuary, -6.3 °C
Soil back at 1 °C in spring4 February
Daylight11:59 on 27 September
Daylight at the winter solstice9:25

The same dates in Grand Junction hold for Garlic, Tulip, Daffodil and Hyacinth.

Crocus in Grand Junction: depth, winter cold, pests and pets

Plant Dutch crocuses (Crocus vernus) about 12 cm deep and 9 cm apart; smaller species go 7–10 cm deep (RHS).

In Grand Junction the average daily temperature stays at 10 °C or lower for about 22 weeks a year (our estimate from ten years of monthly weather). For this bulb Wisconsin Horticulture Extension gives a cold period of 15–17 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

Crocuses multiply on their own (they naturalise); in a lawn, hold off mowing until their leaves die back (RHS).

Birds, squirrels and rodents damage crocuses; planting under metal mesh may reduce losses (RHS). Spring crocus gives dogs and cats vomiting and diarrhoea; do not confuse it with autumn crocus (Colchicum), which is very toxic (Pet Poison Helpline).

Sources: RHS, Wisconsin Horticulture Extension, Pet Poison Helpline.

Crocus in nearby cities

Around Grand Junction, Cheyenne is 14 days earlier and Pueblo 1 day later.

CityDistanceDateDifference
Denver316 km15 September – 14 December12 days earlier
Salt Lake City339 km26 September – 23 December1 day earlier
Fort Collins340 km21 September – 5 December6 days earlier
Pueblo356 km28 September – end of December1 day later
Cheyenne392 km13 September – 4 December14 days earlier
Santa Fe (United States)444 km26 September – 11 December1 day earlier

Where to buy crocus for planting in Grand Junction

Planting stock goes into the ground from 27 September to about 7 December; buy it before that. Within 15 km of Grand Junction OpenStreetMap lists 5 garden centres, 1 farm-supply shop, 1 market and 1 farm shop (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Grand Junction?

In Grand Junction, crocus: plant from 27 September to about 7 December. Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

When is the last spring frost in Grand Junction?

Last spring frost around 18 April, first autumn frost around 27 October.

Other crops in Grand Junction, with their dates