I've built quite a few pole buildings. I discovered that if you dig a 4' hole and mix and pour 1 bag of ready mix and let set for a few days, the concrete becomes your footing below frost level. Set the pole onto the concrete footing and backfill with sand, compacting the sand every foot or so with the handle of your shovel. The sand around the pole allows water to run through it, thus not submerging the pole and not giving anything for the frost to grab and heave. This method allows you to move the poles N - S and E - W for a fudge factor. When your ready to set the purlins and girts for your metal siding you can plumb as you go.

Your less likely to get a deep frost in snow country as the snow insulates the ground.

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