where was drums along the mohawk filmed

Short answer:
Drums Along the Mohawk (1939) is set in New York’s Mohawk Valley but was filmed largely in Utah , using several scenic locations there.

Main Filming Locations

Most of the outdoor scenes were shot in southern and central Utah, standing in for 18th‑century upstate New York.

Key locations include:

• Aspen Mirror Lake, near Duck Creek Village, Utah, USA
• Duck Creek area, near Kanab, Utah, USA
• Strawberry Valley / Strawberry Point, Dixie National Forest, Utah, USA
• Mirror Lake (listed as “Aspen Mirror Lake” in some sources), Utah, USA
• Navajo Lake, Utah, USA
• Sidney Valley, Utah, USA
• Cedar Breaks National Monument / Cedar City area, Utah, USA

All of these Utah landscapes were used to represent the forests, valleys, and frontier farms of the Mohawk Valley during the Revolutionary War period.

TL;DR: Although the story takes place in New York’s Mohawk Valley, the movie was filmed mainly around Aspen Mirror Lake, Duck Creek, Strawberry Valley, Navajo Lake, Sidney Valley, and Cedar Breaks National Monument in Utah.

Information gathered from public forums or data available on the internet and portrayed here.