It's amazing out there! If you have Arugula, put it in the ground! If you have Broad Beans get them planted. Carrots! Go! Chickpeas!! Endive and Radicchio, Kale and Collards, Kohlrabi, Mesclun salad mixes, almost onions, definitely scallions, the choi family, Parsnips and my favourite, Peas! I know that I don't have the seeds for some of these but please feel free to get what you can from me especially since I am still new and I can get to your order in a timely manner! And if you live in Guelph it will either get to you the same day or the next day!
And don't forget about the amazing resource: https://www.almanac.com/gardening/planting-calendar for planting dates!
You can direct sow seeds in every month of the spring, summer, and fall. Here's a list of things to plant in June in the zone 5 zone. Guelph is in the zone 5 zone as is a lot of the rest of Canada. If you don't know which zone you're in, check the zone map found on this site.
Bush and pole beans, Beets, broccoli, Carrots, Cucumber, kale Lettuce, Parsnips, Potatoes, Radish, Turnips, Zucchini.