Great thread and great replies folks. I've only asked a land owner twice and both said yes. I asked where I could park and made sure to not walk across any farmland. However, I had worked on their houses previously, so that was kinda my "in".
I tour the crowsnest/old man/FTR area annually and every year I wonder about this. There are MANY stretches that I want to hit up (old man specifically) but have never actually parked the vehicle and walked up to a home to ask if I can park on their land, then walk, and fish. I just drive by and wonder. Lol.
I've heard it helps to have a small offering.