Can I travel to Canada with US refugee travel document?

If you are a lawful permanent resident of the United States and do not have a passport, you can travel to Canada from US with a valid U.S. Refugee Travel Document (I-571) and official proof of your lawful permanent resident status. 

A formal document proving your status as a lawful permanent resident of the United States is required, such as one of the following:

• A current card for permanent residence (Form I-551)
• A temporary I-551 stamp, known as an Alien Documentation, Identification, and Telecommunication (ADIT) stamp, that has not expired on a foreign passport.
• Foreign passport with a temporary I-551 printed notation (“After authentication serves as a temporary I-551 evidencing permanent residence for 1 year”) on an immigrant visa that can be read by The device, when certified with an admission stamp from U.S. Customs and Border Protection.
• Expired permanent resident card (Form I-551) along with Form I-797 (Notice of Action) for pending Form I-751 (Petition to Remove Conditions on Residence) or Form I-829 ( Investor's petition to Remove Conditions on Permanent Residence)
• Expired permanent resident card (Form I-551) plus Form I-797 (Notice of Action) for pending Form I-90 (Application to Replace Permanent Resident Card [green card])
• Valid re-entry permit (Form I-327)
• Form I-94 with a passport-style photo and an active temporary I-551 stamp (ADIT stamp).