Last and first frost dates in London (Canada)

When is the last frost in London (Canada)?

The last frost in London (Canada) usually comes around 28 April: 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 7 April, while corn waits until 8 May. The first autumn frost follows around 7 November, about 193 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 London (Canada)

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 5 days before the last spring frost and 15 °C 21 days after it.

Frost dates near London (Canada)

Of the nearest cities on our list, the last spring frost ends earliest in Erie (10 April) and latest in Kitchener (30 April).

Seeds, seedlings and markets in London (Canada)

Within 15 km of London (Canada) OpenStreetMap lists 5 garden centres, 3 markets and 2 farm shops (collected 20 October 2026). The nearest market to the city centre is The Market, 1 km away.

• The Market — market
  King Street 900, N5Y 5P8 London · 1 km · westernfairdistrict.com
• Millar Berry Farms — farm shop
  Longwoods Road 7375, N6P1L2 London · 11 km · millarberryfarms.com
• Covent Garden Market — market
  King Street 130, N6A 1C5 London · Tue–Sat 09:00–19:00; Sun 10:00–17:00 · 2 km · coventmarket.com
• The Living Centre — farm shop
  Bells Road 5871, N6P 1P3 · 15 km · thelivingcentre.com

• Where to buy seeds and seedlings in London (Canada)
• Selling your own harvest in Canada

Places: © OpenStreetMap contributors, ODbL.

Weather in London (Canada) by month

Average weather in London (Canada) over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: June–September (22.8–27 °C). Nights average below 0 °C in December–March (-6.9–-2.4 °C). About 1033 mm of rain falls in a year, on 150 days; April is the wettest month (103 mm) and September the driest (62 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).