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When to plant crocuses in Penza: 15 September – 31 October

In Penza, crocus: plant from 15 September to about 31 October.

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 Penza: soil, season and weather

Nights then average below 0 °C in November–March; the coldest, January, averages -11.2 °C.

Planting15 September – 31 October
First autumn frost15 October
Coldest nightsJanuary, -11.2 °C
Soil back at 1 °C in spring1 April
Daylight12:45 on 15 September
Daylight at the winter solstice7:32

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

Crocus in Penza: 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 Penza the average daily temperature stays at 10 °C or lower for about 30 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 Penza, Saransk is 1 day earlier and Saratov 11 days later.

CityDistanceDateDifference
Saransk109 km14 September – 29 October1 day earlier
Saratov198 km26 September – 7 November11 days later
Tambov244 km19 September – 5 November4 days later
Tolyatti290 km23 September – 1 November8 days later
Samara342 km21 September – 30 October6 days later
Nizhny Novgorod354 km18 September – 29 October3 days later

Where to buy crocus for planting in Penza

Planting stock goes into the ground from 15 September to about 31 October; buy it before that. Within 15 km of Penza OpenStreetMap lists 11 garden centres, 1 farm-supply shop, 1 plant nursery, 7 markets and 4 farm shops (collected 27 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Penza?

In Penza, crocus: plant from 15 September to about 31 October. 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 Penza?

Last spring frost around 30 April, first autumn frost around 15 October.

Other crops in Penza, with their dates