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When to plant crocuses in Rennes: by 29 October

In Rennes, crocus: plant by 29 October. The winter here is too mild for our late-planting rule, so we give no later limit. For planting stock, the places nearby include Brin d'Herbe (farm shop, 5 km) and Le Moulin de Charbonnière (farm shop, 5 km); addresses and opening hours are below.

Crocus in Rennes: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 2.9 °C.

Plantingby 29 October
First autumn frost28 November
Coldest nightsJanuary, 2.9 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:08 on 29 October
Daylight at the winter solstice8:21

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

Crocus in Rennes: 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 Rennes the average daily temperature stays at 10 °C or lower for about 21 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 Rennes, Le Mans is 4 days earlier and Le Havre 14 days later.

CityDistanceDateDifference
Nantes99 kmby 30 October1 day later
Angers110 kmby 28 October1 day earlier
Le Mans140 km25 October – end of December4 days earlier
Caen154 kmby 5 November7 days later
Quimper180 kmby 9 November11 days later
Le Havre202 kmby 12 November14 days later

Where to buy crocus for planting in Rennes

Planting stock goes into the ground by 29 October; buy it before that. Within 15 km of Rennes OpenStreetMap lists 21 garden centres, 5 farm-supply shops, 3 plant nurseries, 41 markets and 19 farm shops (collected 20 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Rennes?

In Rennes, crocus: plant by 29 October. The winter here is too mild for our late-planting rule, so we give no later limit.

When is the last spring frost in Rennes?

Last spring frost around 12 March, first autumn frost around 28 November.

Other crops in Rennes, with their dates