Idaho Tore Down Local STR Rules. Colorado Just Built More.

Two weeks ago the story was Idaho stripping counties of their power to regulate short-term rentals. This week a Denver-metro county did the opposite — primary-residence rules, a 500-foot buffer, a $350 license. Same region, same month, opposite direction. If you operate across state lines, the ground isn't level.

Arapahoe County, Colorado — the southeast slice of the Denver metro — passed Ordinance 2026-01 on May 12. It took effect June 12. For short-term rentals in unincorporated parts of the county, the rules are now some of the more restrictive in the metro.

The license runs $350 a year, plus a $200 one-time application fee. In most cases the licensee has to be an owner or long-term renter using the home as a primary residence — unless the property qualifies for a legacy exemption, which covers owners who were already operating in the six months before the ordinance passed. New short-term rentals have to sit at least 500 feet from an existing one, and multifamily properties are capped at 100 licenses. Every license needs a local agent reachable by phone within 15 minutes and able to be on-site within 60. Existing operators have 60 days from the effective date to apply.

Here's why this matters against the Idaho story. Colorado's statewide preemption bills failed this session. That left local governments with full authority to write their own rules — and they're using it. Idaho went the other way and took that authority away. If you underwrite the Mountain West as one regulatory climate, you're going to be wrong somewhere.

The demand picture is splitting too, and not the way the headlines suggest. A couple of weeks back we covered the June reversal at both parks — record May, then a step down. But visitation and revenue aren't the same signal. In Teton County, average hotel occupancy rose from 55.7% to 57.3% in May and climbed about 4% in June, and was tracking up 2.5% for July as of the end of June. Jackson Hole Airport enplanements were up 16% in May and 13% in June. Fewer people through the park gates. More money in the market.

In Colorado, the primary-residence requirement is the exposure that ends deals. If a jurisdiction requires the licensee to live in the property, the pure investment-STR model doesn't work there. Confirm the residency rule for your exact parcel before you write an offer, not after.

Run the buffer before you close. A 500-foot separation rule means an existing STR near your target can block your license no matter what you pay in fees. Map the permitted rentals around the address first. In a saturated pocket, the property may not be an STR play at all — and it should be priced like it isn't.

Check renewal terms on anything you already own. Some jurisdictions grandfather current permits but apply new spacing and residency rules at renewal. Know your date and know whether you'll still qualify under it.

In Idaho, understand the window rather than assuming it's permanent. Preemption passed this year; it can be revisited in a future session if local governments and housing advocates push back. Underwrite the regulatory ease you have today, but don't price it as if it's locked in for a decade.

Arapahoe isn't acting alone. In a single week this May, six small and mid-sized markets moved new STR ordinances — Madison, Wisconsin; Bakersfield, California; Berea, Ohio; Decatur, Alabama; Arapahoe County; and West Columbia, South Carolina. Together they host roughly 7,500 active listings and more than $150 million in annual short-term rental revenue.

The pattern worth underwriting: regulatory action has moved off the marquee cities and into second-tier counties most operators aren't tracking. If your model assumes the regulatory risk lives in Denver or Austin, you're watching the wrong map. Screen the county before the deal, every time.

Know an STR operator or campground owner who'd find this useful? Forward this email — they can subscribe at timberlineoperator.com.

Underwriting a deal across two states with two different rulebooks? Reply and tell me which line you're trying to cross. I read every one.

— Timberline Operator

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