All purchasers of Ontario fishing licenses must have an Ontario Outdoors Card. Both Outdoors Cards and Ontario fishing licenses may be purchased online at this website. DO NOT plan on buying your Outdoors Card and fishing licenses at ranger stations.

Outdoors Cards are good for three years. Fishing licenses may be purchased in advance of your trip with the starting date chosen at time of purchase. (Example: If you'd like to purchase your 8-day conservation fishing license today, but your trip isn't until September 15, you would just enter September 15 on the online form as the start of your 8-day license.

JackFish, that link above is dead, they have a new one now.

campnfish: "JackFish, that link above is dead, they have a new one now."
Corrected now. Thanks for the alert.