Tremors Movies: Story Timeline
This chronological watch order begins with the 1889 prequel Tremors 4: The Legend Begins, which tells the origin story of the Graboid threat and features Michael Gross as Burt Gummer's ancestor.
The timeline then follows the modern-day entries as the creatures evolve and spread to new locations. Starting with the period prequel provides historical context for the Graboid menace.
There are 2 other watch orders available - see the links up above.

Tremors 4: The Legend Begins
In 1889, mysterious deaths plague a mining town, causing miners to flee in terror and leaving behind a nearly abandoned community. This prequel explores the origins of the deadly underground creatures that would later terrorize the desert town of Perfection.

Tremors
Two handymen in a remote desert town must fight for survival when massive underground creatures begin terrorizing the community.

Tremors 2: Aftershocks
Earl Bassett is called upon once again when a Mexican oil company discovers deadly underground creatures similar to the Graboids he previously fought in Perfection.

Tremors 3: Back to Perfection
Survivalist Burt Gummer returns to the desert town of Perfection to face a new threat from the evolving underground creatures known as Graboids.

Tremors 5: Bloodlines
Monster hunter Burt Gummer travels to South Africa with his new partner Travis Welker to battle the deadly underground creatures known as Graboids in this fifth installment of the creature feature franchise.

Tremors: A Cold Day in Hell
Burt Gummer and Travis Welker travel to the Canadian arctic to investigate deadly attacks by giant underground worms, finding themselves in a brutal fight for survival in the frozen wilderness.

Tremors: Shrieker Island
When hunters genetically modify Graboid eggs, they unleash an army of larger, more intelligent creatures and rapidly multiplying Shriekers in an all-out monster battle.
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Romero's Living Dead
George A. Romero's groundbreaking zombie saga, featuring classic horror films and several reboots.
Ryan Reynolds
Canadian actor known for his quick wit, comedic timing, and action-hero charisma across romantic comedies, superhero films, and dramatic thrillers.
Warlock
A supernatural horror trilogy featuring different standalone stories about malevolent warlocks, connected more by theme than narrative continuity.
X-Men
A sprawling superhero franchise following mutants with extraordinary abilities, spanning multiple timelines and generations from the 1960s to the future.