Manitoba · Growing Zone 3b
Gardeners in Winnipeg, MB can expect the average last spring frost around May 22, and the first fall frost around September 22, based on historical Environment Canada frost data for the area. That gives Winnipeg a frost-free growing season of roughly 123 days. Actual frost dates shift by a week or two year to year, so use this as a planning baseline rather than an exact guarantee, and always check your local forecast before moving tender plants outside.
Most warm-season crops (tomatoes, peppers, squash) need transplanting only after the last frost has passed, and are usually started indoors 6 to 8 weeks before that date. Cold-hardy crops (peas, lettuce, spinach) can often go in the ground a few weeks before the last frost. As Winnipeg's first fall frost approaches in September, it's time to plan the last harvests for anything frost-sensitive still in the ground.
GrowBlock builds your whole season timeline around dates like these automatically, indoor seed starting, transplant windows, and harvest, tuned to Winnipeg specifically.
Plan your Winnipeg gardenAround May 22 on average, though it can vary by a week or two either way depending on the year.
Winnipeg is in zone 3b, with a frost-free season of about 123 days.