Last and first frost dates in Quebec City

When is the last frost in Quebec City?

The last frost in Quebec City usually comes around 5 May: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 14 April, while corn waits until 23 May. The first autumn frost follows around 28 October, about 176 days later: harvest or cover frost-tender crops before then.

When to sow and plant

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. Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

When the soil warms up in Quebec City

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 11 days after the last spring frost and 15 °C 22 days after it.

Frost dates near Quebec City

Of the nearest cities on our list, the last spring frost ends earliest in Bangor (24 April) and latest in Saguenay (14 May).

Seeds, seedlings and markets in Quebec City

Within 15 km of Quebec City OpenStreetMap lists 6 garden centres, 1 farm-supply shop and 3 markets (collected 20 October 2026). The nearest garden centre to the city centre is L'Haies Pro, 4 km away.

• L'Haies Pro — garden centre
  Rue De Ségur 1633, G6W 0T6 Lévis · Mon–Fri 06:00–18:00 · 4 km · haiespro.com
• Centre SMG — farm supply
  Boulevard Wilfrid-Hamel 6325, L'Ancienne-Lorette · 11 km
• The Artisans of the Quebec Cathedral — market
  Mon–Sun 10:00–18:00 · 0 km · facebook.com
• Jardin Hamel — garden centre
  Boulevard Wilfrid-Hamel 6029, L'Ancienne-Lorette · Mon–Wed 09:00–18:00; Thu–Fri 09:00–21:00; Sat–Sun 08:30–17:00 · 10 km
• Marché public de Sainte-Foy — market
  Avenue Roland-Beaudin 920, G1V 4H8 Québec · May–Oct Mon–Sun 08:00–18:00 · 8 km · marchesaintefoy.com
• Centre Jardin de l'aeroport — garden centre
  Route de l'Aéroport 1762 · 13 km · jardindeaeroport.com

• Where to buy seeds and seedlings in Quebec City
• Selling your own harvest in Canada

Places: © OpenStreetMap contributors, ODbL.

Weather in Quebec City by month

Average weather in Quebec City over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: June–September (20.2–25.4 °C). Nights average below 0 °C in November–April (-13.9–-1.3 °C). About 1340 mm of rain falls in a year, on 158 days; July is the wettest month (161 mm) and January the driest (83 mm).

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

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).