Ontario · Growing Zone 6b
Gardeners in Mississauga, ON can expect the average last spring frost around April 15, and the first fall frost around November 4, based on historical Environment Canada frost data for the area. That gives Mississauga a frost-free growing season of roughly 203 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 Mississauga's first fall frost approaches in November, 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 Mississauga specifically.
Plan your Mississauga gardenAround April 15 on average, though it can vary by a week or two either way depending on the year.
Mississauga is in zone 6b, with a frost-free season of about 203 days.