Buying or Selling in Longmont, Colorado: Market Numbers, the County Line, and the Rules Most Guides Skip

Market Right Now

A 41-day median and roughly two offers per listing describe a market with real but limited competition: enough activity that pricing a home 10% over recent comparable sales invites it to sit unsold, without the bidding-war pressure of a tight seller’s market.

Is Longmont’s market currently favoring buyers or sellers? Neither decisively. A 41-day median and an 8.4% year-over-year rise in price per square foot describe a market close to balanced, per Redfin’s market data.

Boulder County or Weld County: Why the Line Matters

Longmont is one of the few Front Range cities split by a county line, and it runs through developed parts of the city, not only its rural edges. The city itself levies 13.42 mills regardless of which county a parcel sits in, according to the City of Longmont’s own property tax page; what changes is everything layered on top of that municipal levy.

On a median-priced Longmont home, the gap between 0.58% and 0.60% works out to a few hundred dollars a year, according to Ownwell’s Boulder County figures and its Weld County figures. What the county line changes more meaningfully is which assessor’s office, which school-bond ballot measures, and which special districts apply to a given parcel – details worth checking before closing, not after.

What county is Longmont in – Boulder or Weld? Both. The city limits cross the Boulder–Weld county line, so a Longmont address can sit in either county depending on the parcel, each with its own assessor and a slightly different effective tax rate.

Price by ZIP: What Different Parts of Longmont Buy

80501 sits roughly $230,000 below 80503 in typical value, per Zillow’s 80501 data and HousingData.report’s ZIP breakdown – a wider spread than the entire county-line tax difference above, and the bigger lever on what a comparable house actually costs.

What It Costs Beyond the Mortgage

At current rates, owning runs close to double the monthly cost of renting the equivalent unit before property tax and insurance are layered on top of that $3,179 estimate. That gap is wide enough to model on a spreadsheet rather than assume away with a general “buying builds equity” line.

Schools

Longmont sits in the St. Vrain Valley School District. Silver Creek High School, one of 12 high schools in the district, carries a GreatSchools rating and ranks 35th among Colorado high schools nationally, with a 65% Advanced Placement participation rate, according to U.S. News’ ranking. That is a specific, checkable figure, not a “highly rated district” claim – the same lookup is worth running for any specific school a target address feeds into, since ratings vary school to school within one district.

How competitive are St. Vrain Valley schools? Silver Creek High School, one of 12 in the district, ranks 35th in Colorado with 65% AP participation. Check GreatSchools or U.S. News for the specific school a given address feeds into, since scores vary within the district.

The Economy Behind the Growth

Longmont’s largest employers by headcount, per the Longmont Economic Development Partnership’s own 2024 list, are St. Vrain Valley Schools (5,848 employees), the City of Longmont (1,300), UCHealth Longs Peak (1,053), and Seagate Technology (800); Micron Technology appears further down the same list at 200 employees.

Away from the office, the average Longmont worker’s commute runs 24.4 minutes, close to the 26.4-minute national average, and 22.3% of Longmont workers work entirely from home, per the Census Bureau’s American Community Survey figures for Longmont. Those who do commute out typically use US 287 or the Diagonal Highway (CO-119) toward Boulder and Denver.

Before You Buy: Flood Zone, Growth Policy, and Short-Term Rental Rules

Flood Risk and the 2013 Event

Longmont’s most significant flood in city history struck in September 2013. In the years since, the city has been building the Resilient St. Vrain project: 8 river miles of channel work aimed at safely conveying a 100-year flood and removing an estimated 818 acres and 526 structures from the mapped floodplain, according to a city engineering presentation on the project. In January 2025, FEMA approved $1,008,150.50 in hazard-mitigation funding, covering 70% of planning costs, for Phase I of the project’s Hover Road Reach segment alone. Before writing an offer near the St. Vrain corridor, check the current FEMA flood map for that specific parcel: floodplain boundaries here have shifted more than once as this project has progressed.

Is Longmont at risk of flooding? The St. Vrain corridor has a documented history – the 2013 flood was the city’s worst on record – and mitigation work is still removing structures from the mapped floodplain more than a decade later. Check the parcel-specific FEMA flood map before buying near the creek.

Growth Management and New Supply

Longmont’s Envision Longmont plan, adopted by the city in June 2016, sets a 10-to-20-year land-use and growth framework for the city, according to the City of Longmont’s own plan page. A separate intergovernmental agreement with Boulder County fixes a defined annexation boundary around the city, which is part of why new-construction supply grows steadily along planned corridors rather than sprawling outward indefinitely – worth factoring in if inventory growth is part of a buying or selling timeline.

Short-Term Rentals

Longmont requires a short-term rental license plus a separate sales-and-use tax license for any rental under 30 days, according to the city’s short-term rental page. Only City of Longmont residents may hold a license, capped at one investment dwelling per owner, and operating without one can bring fines up to $500 per day. Non-residents cannot legally operate a short-term rental in the city at all.

Can I run a short-term rental in Longmont if I don’t live there? No. Longmont limits STR licenses to city residents, ruling out non-owner-occupant operators regardless of how the property is financed.

Recreation and Lifestyle

Longmont’s recreation core runs along the St. Vrain Greenway, McIntosh Lake, and Union Reservoir, with a walkable downtown Creative District anchored by Left Hand Brewing. None of this is unique to Longmont among Front Range cities, and it rarely decides a serious buy-versus-Boulder or buy-versus-Loveland comparison.

Who Longmont Actually Fits

• Families relocating for schools or space: the ZIP-level price spread ($500,803 in 80501 versus $731,433 in 80503) affects budgeting more than the county line does; check the specific school a target address feeds into rather than relying on a district-wide reputation.
• Investors: the resident-only STR rule removes short-term rental as a strategy for anyone not planning to live in Longmont; long-term rental math should start from the roughly $1,861 average rent against the roughly $3,179 estimated mortgage payment.
• Remote workers: NextLight’s fiber footprint and the 22.3% work-from-home share are figures worth verifying at a specific address before assuming connectivity is a non-issue citywide.