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Irkutsk: frost dates

Russia

In Irkutsk the last spring frost usually comes around 14 May and the first autumn frost around 30 September, which leaves about 139 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground around 26 May.

Last spring frostaround 14 May
First autumn frostaround 30 September
Frost-free days139 days

Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.

When to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Achocha21 March30 April21 May
Arugula—2 Aprilsow 23 April
Basil17 April25 May15 June
Beet—2 Aprilsow 23 April
Bell Pepper12 March25 May15 June
Black-eyed Susan20 March—21 May
Bok Choy26 March30 April21 May
Broad bean—2 Aprilsow 23 April
Broccoli—2 Aprilsow 23 April
Brussels Sprouts16 February2 April23 April
Cabbage—2 Aprilsow 23 April
Calendula—2 Aprilsow 23 April
Carrot——sow 23 April
Cauliflower19 February2 April23 April
Celeriac12 February30 April21 May
Celery12 February30 April21 May
Celosia25 March9 May30 May
Chamomile—2 Aprilsow 23 April
Chayote1 February30 April21 May
Chickpea——sow 23 April
Chili Pepper21 March3 June24 June
China aster3 April25 May15 June
Chives——sow 23 April
Cilantro—2 Aprilsow 23 April
Corn—30 Aprilsow 21 May
Cosmos25 March9 May30 May
Cucumber13 April25 May15 June
Daikon—2 Aprilsow 23 April
Delphinium23 February—23 April
Dill—2 Aprilsow 23 April
Eggplant16 March25 May15 June
Florence fennel16 March30 April21 May
Garden sorrel—2 Aprilsow 23 April
Green Beans24 March30 April21 May
Hyssop——sow 23 April
Kale—2 Aprilsow 23 April
Kiwano3 April5 May26 May
Kohlrabi—2 Aprilsow 23 April
Leek22 January2 April23 April
Lemon balm—2 Aprilsow 23 April
Lettuce—2 Aprilsow 23 April
Lisianthus5 January2 April23 April
Lovage——sow 23 April
Luffa13 April25 May15 June
Marigold19 March30 April21 May
Melon3 April25 May15 June
Microgreens—9 Maysow 30 May
Moringa9 April3 June24 June
Mustard greens—2 Aprilsow 23 April
Napa cabbage28 March30 April21 May
Nasturtium23 March30 April21 May
Okra13 April25 May15 June
Oregano1 February2 April23 April
Pansy5 February2 April23 April
Parsley—2 Aprilsow 23 April
Parsnip——sow 23 April
Peanut18 April25 May15 June
Peas—2 Aprilsow 23 April
Petunia23 March25 May15 June
Physalis21 March5 May26 May
Pumpkin29 March5 May26 May
Purple coneflower20 February—23 April
Radish——sow 23 April
Sage12 February2 April23 April
Snapdragon27 January2 April23 April
Spinach—2 Aprilsow 23 April
Stevia17 March5 May26 May
Stock—2 Aprilsow 23 April
Sunflower—9 Maysow 30 May
Sweet Corn—30 Aprilsow 21 May
Sweet pea19 February2 April23 April
Sweet William——sow 23 April
Swiss Chard—2 Aprilsow 23 April
Thyme—2 Aprilsow 23 April
Tomato9 March5 May26 May
Turnip—2 Aprilsow 23 April
Watercress—2 Aprilsow 23 April
Watermelon23 April25 May15 June
Zinnia29 April3 June24 June
Zucchini3 April5 May26 May

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day.

Weather in Irkutsk by month

Average weather in Irkutsk over 2016–2025: the warmest month is July, the wettest July.

MonthDay, °CNight, °CRain, mmRainy days
January-15-23.7104
February-10.7-21.783
March0.5-11.6135
April10.2-2.3237
May174399
June23.4116211
July24.714.110613
August22.312.89713
September15.76.36410
October6.6-2.3206
November-3.4-11.5144
December-13-21.5144

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

CropPlant around
Bearded Iris31 August
Crocus31 August
Daffodil31 August
Garlic31 August
Hyacinth31 August
Lily31 August
Peony31 August
Saffron31 August
Tulip31 August
Wild garlic31 August

A month before the first autumn frost, so the roots grow before winter.

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