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When to plant peas in Thunder Bay: 20 April – 10 August

In Thunder Bay, peas: sow straight into the bed from 20 April to 10 August.

Peas in Thunder Bay: soil, season and weather

Peas tolerates light frost and could go in three weeks before the last frost (11 May), but the top 7 cm of soil reaches its minimum of 4 °C only around 4 May, 14 days after that.

Last spring frost11 May
Top 7 cm of soil at 4 °C4 May, 7 days before the last frost
First autumn frost23 October, 186 days after the start
Days in the bed to the first harvest (card)74
First harvest, if planted in this window3 July – 23 October
Days left for picking112
Daylight13:56 on 20 April
Watering outdoors when fruiting (card)every 3 days; the driest month, August, has 11 rainy days

Peas in Thunder Bay: care after planting

Planted on 20 April: in the first weeks water every 6 days.

Pests and diseases of peas to watch for:

Weather in Thunder Bay during the peas season

About 520 mm of rain falls in the season; August is the driest month (63 mm) and September the wettest (86 mm).

MonthDay, °CNight, °CRain, mmRainy daysDaylight on the 15th
April6-2.7761013:39
May14.34.3691115:12
June19.910.4811016:05
July23.614.4741115:44
August22.314.2631114:23
September18.210.9861112:38
October10.54.2711010:54

ERA5 2016–2025, Open-Meteo

Peas in nearby cities

All the nearest cities on our list plant peas earlier than Thunder Bay; the closest date is in Grand Forks, 1 day earlier.

CityDistanceDateDifference
Duluth279 km7 April – 15 August13 days earlier
Green Bay439 km8 April – 17 August12 days earlier
Minneapolis487 km7 April – 11 August13 days earlier
Traverse City488 km11 April – 27 August9 days earlier
Grand Forks584 km19 April – 3 August1 day earlier
Fargo589 km9 April – 3 August11 days earlier

Where to buy peas seeds in Thunder Bay

Seeds go straight into the bed from 20 April to 10 August; buy them before that. Within 15 km of Thunder Bay OpenStreetMap lists 2 garden centres and 1 market (collected 20 October 2026).

Places: © OpenStreetMap contributors, ODbL.

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.

Questions

When to plant peas in Thunder Bay?

In Thunder Bay, peas: sow straight into the bed from 20 April to 10 August.

When is the last spring frost in Thunder Bay?

Last spring frost around 11 May, first autumn frost around 23 October.

Other crops in Thunder Bay, with their dates