As detailed in a profile about the series on the Canadian heavy machinery blog Equipment Journal, "Big Timber" was filmed on Vancouver Island, located off the coast of Vancouver, British Columbia just north of the Canada-United States border. Specifically, Wenstob and company are operating on a claim of land on a remote part of Vancouver Island called Klitsa Mountain. Its rugged terrain poses a natural challenge for Wenstob's logging operation, thus contributing to the drama driving the 10 episodes of "Big Timber" filmed thus far.
Klista Mountain is home to a plentiful amount of cedar and hemlock trees, which Equipment Journal describes as "some of the best wood in the world." While the total amount of lumber on the mountain could fill upwards of 1,000 truckloads, Wenstob's goal over the course of the series' first season is to transport 200 truckloads of lumber back to his sawmill prior to the advent of cold weather making his logging operation inviable.
The Klista Mountain filming location of "Big Timber," then, not only makes for a pretty backdrop, but also is essential to the series' core conflict.