Can I visit Canada with felonies?

"Section 19(2)(a.1) of the Immigration Act of Canada states that persons convicted of an offence outside of Canada, that would be an offence under Canadian law, cannot be admitted to Canada. Criminally inadmissable persons can, however, apply for a special permission to enter Canada. This special permission is expressed by a Minister's Permit."

Any person living in the United States who possesses a criminal record and wishes to travel to Canada will need a Ministers Permit. This is valid up to one year. One may also apply for a Rehabilitation. This document is a permanent approval, and allows hassle free border crossing into Canada.
The Canadian Government will look at each application individually. They will consider the following factors:

1) Nature of conviction
2) Date of last conviction
3) Sentencing
4) Reasons for travel

A Ministers Permit may take up to 6 months for processing. A personal interview may be required at the port of entry nearest the applicant's residence.

Rehabilitation allows lifetime access into Canada. This document never needs to be renewed. A Ministers Permit and Rehabilitation does not permit one to work in Canada. These approvals allow visitation for a period up to 6 months at a time.
(source for the above)

Also see here: Traveling to Canada

And here: How to Travel to Canada with a Felony Charge

Correct but it is no longer called a Minister's Permit, now it's just called a Temporary Resident's Visa, (first link). You can apply and if you are denied you will have to look into the "deemed rehabilitation" program (second link). The links below are from CIC, Canada's immigration agency.

Visiting Canada: Temporary Resident Visas – How to apply

Overcoming criminal inadmissibility