When Does Cuffing Season Actually Start in Portland? The Data Says the Premise Itself Doesn't Quite Fit
Let's start with the number that complicates the entire idea of "cuffing season" in Portland: 39%.
That's the share of Portlanders who've used OkCupid in the past two years and said they'd consider an open relationship — well above the roughly one-third of American singles nationally who report having had a consensually nonmonogamous relationship at some point, per Match's 2024 Singles in America study. On Feeld, the dating app that markets itself to the "curious," Portland users identifying with nonmonogamy-related terms grew 120% between 2021 and the data Axios reported in 2024. A 2018 Portland Mercury sex survey found 13% of respondents identified as non-monogamous outright, with another 38% describing themselves as "monogam-ish." Local psychotherapists and sex-positive community organizers describe Portland as having overtaken even Seattle — long informally known as the "poly capital" of the Pacific Northwest — as the region's most active hub for ethical non-monogamy per capita.
Every other city in this series has been analyzed on the assumption that "cuffing season" means the same thing everywhere: singles pairing off, one on one, before the season closes in. In Portland, that assumption itself needs a caveat.
Cuffing season, as a concept, assumes a specific relationship shape. Portland has meaningfully more people opting out of that shape than most cities.
Nationally representative research published in Frontiers in Psychology found roughly 1 in 6 Americans (16.8%) desire to engage in polyamory, and about 1 in 9 (10.7%) have done so at some point — figures that show no significant variation by political affiliation, income, religion, geographic region, or race. Portland's local numbers, while drawn from different and less rigorous surveys, consistently run above that national baseline. That doesn't mean cuffing season doesn't exist here — plenty of Portlanders are looking for exactly the traditional, monogamous, one-on-one pairing the concept describes. It means a real, visible, organized subculture — support groups, discussion meetups, nonprofits like OPEN Northwest, entire local dating-app cohorts — approaches the same seasonal pressure with a genuinely different relationship structure in mind, one where "who are you spending winter with" doesn't presuppose an answer of one person.
And Portland's population and downtown are shrinking in ways that shape who's actually here to date at all.
Portland's population has declined roughly 3.5% since the 2020 Census, continuing to shrink at close to 0.7% a year as of 2026 — one of the few major West Coast cities still losing residents rather than gaining them. The city's own 2026 State of Downtown report describes a region "adjusting to slower population growth, weaker job performance, and mounting structural pressures," with vacant office space now described as one of downtown's defining challenges. It's a more severe, more sustained version of the "third places disappearing" story that's shaped dating patterns in cities across this series — except in Portland, it's not just bars and social venues thinning out, it's the population itself.
Financially, Portland's dating pool is working against real headwinds too.
A late-2025 WalletHub ranking of the best U.S. cities for singles put Portland at 160th out of 182 cities on its economic sub-ranking, despite scoring in the top 10 nationally for sheer "fun" — nightlife, breweries, and recreation options. That combination — genuinely strong social infrastructure paired with a weak economic picture — is a specific and somewhat unusual mix in this series: Portland isn't short on places to meet people or things to do once you're there, but the city's broader economic contraction means fewer people are moving in to fill that social infrastructure than there used to be.
What this looks like on Portland's calendar:
Year-round: A visible, organized non-monogamy community running in parallel with the city's traditional dating scene — not a replacement for cuffing season, but a real complication to assuming everyone's looking for the same thing.
Rainy season (roughly October–April): Portland shares the broader Pacific Northwest's wet-season pattern, similar in shape to Seattle's, pushing casual outdoor dating indoors for much of the year.
Ongoing, and structural rather than seasonal: A shrinking population and a downtown still working through post-2020 vacancy and foot-traffic recovery, meaning the dating pool itself is a smaller target than it was five years ago.
What this means for Portland singles specifically.
Most cities in this series have singles asking when to start looking, or who's looking with intention. Portland adds a genuinely different question underneath both of those: what kind of relationship is this person actually looking for in the first place? With a documented, above-national-average share of the dating pool at least open to non-monogamy, alongside a shrinking population and a downtown still rebuilding its social infrastructure, the usual cuffing-season advice — get ahead of the season, be deliberate before the deadline — needs a Portland-specific first step: understanding what kind of pairing off someone's actually interested in, before assuming the traditional one.
Sources: Axios Portland, "Data shows Portland's polyamorous community is growing" (2024); Willamette Week, "A Beginner's Guide to Polyamory" (2023); Cascadia Magazine, "Polyamory in the Pacific Northwest" (2019); Moors, Gesselman & Garcia, "Desire, Familiarity, and Engagement in Polyamory," Frontiers in Psychology (2021); Portland Metro Chamber, 2026 State of Downtown & the Central City report; World Population Review and Oregon Demographics, 2026 Portland population data; KOIN News / WalletHub, Best Cities for Singles 2025 ranking.