Q.I Live In Prince Edward Island, CANADA When Is The Best Time To Plant My Garden?
We have a relatively short growing season 100 to 115 days. Tomatoes have been my biggest problem. I get green tomatoes but they do not ripen. Help I have wireworms. I have tried getting rid of them by growing Buckwheat. I have not been totally successful. Is there any other non chemical procedure I might try?

Certified GKH Gardening Expert
Tomatoes will be very tricky in your zone, unless you grow them indoors. If you can transplant a mature plant outside, you may get a harvest.
Generally, you will treat your area as we would treat our zone 4.
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-4/zone-4-seed-starting.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-4/gardening-in-zone-4.htm
https://www.gardeningknowhow.com/planting-zones/are-canada-zones-similar-to-us.htm