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When to plant crocuses in Concord: 1 October – 25 November

In Concord, crocus: plant from 1 October to about 25 November. For planting stock, the places nearby include Brochu Nurseries And Landscaping (farm supply, 2 km) and Osborne's Farm and Garden Centers (garden centre, 5 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 Concord: soil, season and weather

Nights then average below 0 °C in December–March; the coldest, January, averages -8.1 °C.

Planting1 October – 25 November
First autumn frost31 October
Coldest nightsJanuary, -8.1 °C
Soil back at 1 °C in spring13 February
Daylight11:46 on 1 October
Daylight at the winter solstice8:59

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

Crocus in Concord: 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 Concord the average daily temperature stays at 10 °C or lower for about 27 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 Concord, Montpelier is 14 days earlier and Boston 13 days later.

CityDistanceDateDifference
Manchester (United States)25 km3 October – 27 November2 days later
Boston102 km14 October – 29 December13 days later
Portland, Maine115 km5 October – 26 November4 days later
Montpelier143 km17 September – 11 November14 days earlier
Providence155 km9 October – 30 December8 days later
Augusta187 km4 October – 20 November3 days later

Where to buy crocus for planting in Concord

Planting stock goes into the ground from 1 October to about 25 November; buy it before that. Within 15 km of Concord OpenStreetMap lists 3 garden centres, 1 farm-supply shop and 6 farm shops (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Concord?

In Concord, crocus: plant from 1 October to about 25 November. 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 Concord?

Last spring frost around 22 April, first autumn frost around 31 October.

Other crops in Concord, with their dates