Start with what the public data actually covers
Promontory sits inside ZIP code 84098, on the Snyderville Basin side of Park City. Zillow's typical home value for that ZIP rose from $812,368 in February 2020 to $1,382,166 in August 2026 — a gain of 70.1%, against 50.2% for Salt Lake City over the same period.
Strong. But that number describes the whole ZIP code, which includes a great deal of the basin alongside Promontory. I published the full series, including Old Town and two Salt Lake Valley comparisons, in Promontory's ZIP Code, 2020 to 2026.
The honest summary is that public data answers the area question well and the community question not at all.
The two Park City markets have diverged
The detail most buyers miss is that 84098 and 84060 are not one market. Old Town, ZIP 84060, rose 104.6% since February 2020 and reached $2,198,714. The basin rose 70.1%.
Both are Park City addresses. Their behaviour over six years has been materially different, driven by scarcity of walkable ski-adjacent stock on one side and larger-lot inventory on the other. Anyone comparing a basin home to an Old Town sale is comparing two different markets.
Note too that the steep part of the curve was 2020 to 2021. Since August 2021, 84098 is up 21.7%. The last twelve months were 4.8%.
The four questions that decide the answer
What is the membership, and what are the dues? Promontory is a club community. Membership is bought separately from the home and carries ongoing dues. These costs appear in no index and can change the economics of a purchase entirely. Get the current schedule from the club in writing before you model anything.
How will you use it? A second home occupied six weeks a year, a property rented nightly where permitted, and a primary residence produce different carrying costs and different tax treatment from identical appreciation.
Which part of the community? Cabins, townhomes, homesites and custom estates within a single community do not move together. The right comparable set is usually a handful of properties, not a ZIP code.
What is your horizon? Appreciation of 70% over six years and 4.8% over the last twelve are both true. Which one matters depends entirely on how long you plan to hold.
Why I publish this rather than a brochure
Promontory is the most-asked question in Park City, and most of what is written about it is marketing. The data above is public, checkable, and comes with its limits stated — including the parts that do not favour a quick yes.
If you are weighing Promontory against Glenwild, Silver Creek or Old Town, the useful next step is a property-level comparison with the club costs included. I am glad to build that for a specific address.