Short answer:
The upcoming Yellowstone spin-off Marshals: A Yellowstone Story is set to premiere on Sunday, March 1st, 2026 at 8 PM Eastern (5 PM Pacific) on CBS in the US , with episodes then hitting Paramount+ the following day.

Quick Scoop: When does Marshals premiere?

Here’s the key info packed up neatly:

  • Series title: Marshals: A Yellowstone Story
  • Franchise: New spin-off set in the Yellowstone universe, focusing on Kayce Dutton.
  • Premiere date (US broadcast): Sunday, March 1, 2026.
  • Premiere time: 8 PM Eastern / 5 PM Pacific on CBS.
  • Streaming: Episodes arrive on Paramount+ the following Monday after each CBS airing.
  • Format: 13-episode season, with new episodes weekly on Sundays.

So if you’re planning a watch party, circle Sunday night, March 1st for the live CBS premiere, or catch it Monday on Paramount+ if you prefer streaming.

Mini timeline

  1. Sunday, March 1, 2026 – Episode 1 “Piya Wiconi” airs on CBS at 8 PM ET.
  1. Monday, March 2, 2026 – The same episode becomes available on Paramount+.
  1. Following 12 Sundays – New episodes air weekly on CBS, then hit Paramount+ the next day.

Where to watch

  • Live TV: CBS (check local listings if you’re outside Eastern/Pacific time zones, as local air times can shift slightly).
  • Streaming: Paramount+ the day after broadcast for on‑demand viewing.

TL;DR: Marshals: A Yellowstone Story premieres March 1, 2026, at 8 PM ET on CBS , then on Paramount+ the next day.

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