The short answer is: it doesn’t look like the production has publicly confirmed the exact real‑world house used for the final “Dutton Ranch” party scene yet, so we can’t reliably name it.

What we can tell from current coverage

Recent episode 8 recaps and commentary focus heavily on the story of the finale—Carter’s exit, Beulah’s health scare, and the fallout within the Jackson family—but they don’t specify the real location or name of the house used for the big party sequence.

Most detailed write‑ups concentrate on:

  • The anniversary/celebration setup and Beulah’s near‑death health crisis.
  • The way the party becomes the emotional and narrative climax for the Jackson family and Carter.

None of these articles, though, identify the property by its real‑world ranch name, address, or usual filming alias.

Why the answer is incomplete

TV recaps and think‑pieces rarely list filming locations unless:

  • The production markets a specific ranch or house as part of the show’s branding.
  • The location is already famous (for example, when a series reuses a well‑known estate).

For “Dutton Ranch,” the currently available recap and news coverage emphasize character arcs and plot twists rather than behind‑the‑scenes location details, and I’m not seeing any credible source that says “the final party was filmed at X Ranch / X house.”

Because of that, any specific answer like “It was shot at [some ranch name]” would be guesswork, not fact.

Plausible but unconfirmed possibilities

Shows in this family of modern Western dramas often:

  • Use a primary “hero” ranch or house as the main standing set for most big gatherings.
  • Supplement it with nearby private ranches or event properties when they need a different layout or interiors.

It is therefore likely (but not confirmed) that:

  • The party house in the final episode is either:
    • A different wing/interior of the show’s main ranch set dressed up for the event, or
    • A separate ranch house in the same region, rented specifically for that episode’s big party sequence.

Without official location notes or a production featurette, though, we can’t credibly narrow it further.

How you might find a definitive answer later

If you want to keep digging (or update a forum/wiki post as more info drops), these are the best bets:

  1. Home‑video extras and featurettes
    • Blu‑ray / DVD releases or digital extras sometimes include a “behind the scenes” or “locations” feature that explicitly names the ranch or house.
  2. Interviews with the showrunner or location manager
    • Entertainment outlets occasionally publish location‑focused interviews; those may come later in the season’s post‑mortem coverage.
  3. Local news or tourism write‑ups
    • If the house is a working guest ranch or event venue, regional papers or tourism boards sometimes run “Dutton Ranch filmed here” stories when tourism bumps up.
  4. Production notes or union/location databases
    • Sometimes, production notes list primary filming sites, but these are not always easily accessible to the general public.

Until one of those sources explicitly names the property, the honest status is: not publicly confirmed.

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