Early Explorers & Settlers of the Rocky Mountain Region: French, Spanish, American, British

Who First Explored and Settled the Rockies?

The Rocky Mountain region saw waves of explorers, trappers, and settlers from four imperial powers before becoming American territory.

French Explorers (1670s–1700s)

• Jacques Marquette & Louis Jolliet (1673) – Mississippi to Arkansas River.
• Robert de La Salle (1682) – Claimed entire Mississippi Valley for France.
• Pierre Le Moyne d'Iberville (1699) – Founded Louisiana colony.
• Jean-Baptiste Le Moyne de Bienville (1702) – Founded New Orleans.

Spanish Explorers (1590s–1770s)

• Juan de Oñate (1598) – First Spanish expedition into the Rockies (New Mexico).
• Eusebio Kino (1691) – Sonoran Desert missions (Arizona).
• Juan Bautista de Anza (1775) – Overland route Mexico → California.

American Explorers & Mountain Men (1800s–1840s)

• John Colter (1807) – Lewis & Clark vet; first American in Yellowstone.
• Jedediah Smith (1823) – First American to cross Sierra Nevada; mapped Great Basin.
• Jim Bridger (1824) – Explored Yellowstone, Great Salt Lake; famed guide.
• Kit Carson (1826) – Trapper, guide, Indian agent; key in Fremont expeditions.

British / Canadian Explorers (1790s–1850s)

• David Thompson (1793) – First European to cross Rockies at Athabasca Pass; mapped Columbia River.
• Simon Fraser (1808) – Descended Fraser River (BC) to Pacific.
• John Palliser (1857) – Scientific expedition; "Palliser's Triangle" (arid prairies).

Legacy

These men opened the Rockies to fur trade, military surveys, railroad routes, and eventual settlement. Indigenous nations (Shoshone, Crow, Blackfeet, Ute, etc.) had inhabited and known these mountains for millennia.