I built mine over a sandy soil, not sure if this would work for you. I took 2 X 12's or whatever big flat piece of wood you got drilled a hole in the center then stuck some 1/2in old dock line through it and tied a stopper knot on the back. Then I dug a 2 ft hole and buried it with the line coming out of the ground to use as an anchor, cheap option. This would especially work for you if you did it when the ground was not frozen but then froze it in, it would be very secure I would think. Your ground might already be frozen up there though.
I did the pull test myself and couldn't budge it, they also didn't budge in the recent wind event. When I leave the enclosure I have the frame rachet strapped to the boat itself in three spots so at least I know the cover can tear off but the frame isn't going anywhere where it can blow around and be dangerous.
But the recent wind even was extreme hopefully just a minor set back
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