As u/RioAbajo wrote in this comment 4 years ago, paleoclimatic data such as tree-ring records indicate that really huge fires were much less common in the past than now, and this is due in part to management of woodlands by Native North Americans, and in part to the counterproductive method of fire suppression in the 20th century.

Tree-ring records indicate that small fires, on the other hand, were much more common in certain landscapes, and this--controlled burns--is the key method of fire management by indigenous people that I know of. In the Puget Sound area in the Pacific Northwest, for instance, oak and Douglas fir woodlands show that, prior to Euro-American settlement, fires occurred about every 7 years, many of which were most likely set by native inhabitants (Sprenger and Dunwiddie 2011). Elders' accounts from the Spokan indicate that they used prescribed burning at periodic intervals, which reduced dead vegetation, windfall, and deadfall, and reduced crown fires and lightning fires (Ross 1999). They and Flathead people would also collect lichen for food and to reduce flammable materials. Gitxsan and Wet'suwet'en people in British Columbia have used fire to clear sites around villages, likely in part to reduce summer fire hazard (Johnson 1999).

To move somewhat away from your question, intentional fires were multi-purpose and had a substantial effect shaping, if not creating, forests, savannas, and prairies of the West. Evidence is gathered from tree rings, ethnographic accounts, Euro-American settlers' and explorers' written accounts, and archaeological remains. Based on these data, researchers have concluded that indigenous people shaped landscapes with fires: in forests, burning climax species to make room for diverse non-climax species; in other forests, clearing unwanted undergrowth. Some burned almost all trees in an area in order to create prairies, which are themselves now considered native ecosystems and are today focuses of conservation.

To give more specific examples of the above: Flathead, Pend d'Oreille, and Kootenai people in Montana used fire to influence where game moved, to encourage the growth of forage for horses, and to clear and fire-proof campsites and roads; ecologically, fires enabled western larch and Ponderosa pine to grow, without being outcompeted by Douglas fir and Grand fir (Barrett and Arno 1999). In the Puget Sound, people used fire to create prairies where they grew harvests of camas, nettle, and bracken ferns (Weiser and Lepofsky 2009). Fire is believed to have been used to increase huckleberry harvests by Chinookan and Sahaptin people in Oregon (French 1999). These are just a few of the many known and unknown uses.

Works cited:

Boyd, Robert. 1999. Indians, fire, and the land in the Pacific Northwest. Corvallis, Or.: Corvallis, Or. : Oregon State University Press.
Chapters by: Barrett and Arno, French, Johnson, Ross, and White

Sprenger, Carson B., and Peter W. Dunwiddie. 2011. Fire History of a Douglas-Fir-Oregon White Oak Woodland, Waldron Island, Washington. Northwest Science 85(2):108-119.

Weiser, Andrea, and Dana Lepofsky. 2009. Ancient Land Use and Management of Ebey's Prairie, Whidbey Island, Washington. Journal of Ethnobiology 29(2):184-212, 29.