Colorado Porch

Front Range

Longmont, Colorado

Boulder County · Front Range · city

Longmont was planned from scratch in 1871 by a Chicago colony that named it for the view — Longs Peak, the "Long Mont" standing on the western skyline.

Longmont was a planned town from day one. In November 1870, a group of Chicago businessmen incorporated the Chicago-Colorado Colony, selling memberships to fund a new agricultural community out west. A committee that included Rocky Mountain News founder William Byers and former lumberman Seth Terry came out to Colorado Territory in early 1871, and Terry led a party of settlers to the confluence of Left Hand and St. Vrain Creeks, where a one-square-mile town was surveyed and platted. They named it Longmont for the view of Longs Peak on the western horizon — the "Long Mont." The colony carried an idealistic streak, adopting the motto of industry, temperance, and morality, and it left marks that outlasted it: early public parks, one of the state's first public libraries, and downtown streets — Bross, Collyer, Pratt, Terry — still named for its founders.

What made Longmont was water and dirt. Colonists built a robust irrigation system, and on March 30, 1873 water began flowing into the eight-mile Highland Ditch, turning the plains around town into productive farmland. For most of a century Longmont ran on agriculture and the industries that processed it: flour mills starting in 1872, the J.H. Empson vegetable cannery in 1889, and the Great Western Sugar factory in 1903, drawing waves of Scandinavian, Eastern European, Japanese, and Latin American laborers to work the sugar-beet fields. The city adopted a home-rule charter in 1961, and its economy pivoted with the times — a federal aviation facility arrived in 1962 and IBM announced a big plant in 1965, quietly turning a farm town toward technology.

Today Longmont is a city of roughly 100,000 that kept its own hand on the controls. It's home-rule, and it owns and runs its electric power, water, and — unusually — a citywide municipal fiber network, NextLight, built in the mid-2010s. The defining recent chapter was water again, but the destructive kind: in September 2013, St. Vrain Creek burst its banks, cutting the city nearly in half and causing close to $150 million in damage. Rather than just rebuild, Longmont launched the multi-year Resilient St. Vrain project to re-engineer the creek channel and greenway against future floods — work that has since drawn national and even UN recognition for building back smarter.

Longmont has the feel of a real, working Front Range city rather than a resort or a bedroom suburb. Its historic downtown along Main Street has kept its brick bones, filling in with breweries, restaurants, coffee shops, and a genuinely good local museum, and the St. Vrain Greenway now threads a trail-and-park corridor right through the middle of town along the rebuilt creek. Longs Peak and the rest of the Front Range stand on the western skyline most clear mornings — the same view that gave the place its name — and the foothills, Boulder, and Rocky Mountain National Park are all a short drive west. It's a diverse, family-friendly, increasingly tech-flavored town with its own utilities and famously fast city-owned fiber, and it tends to run a little more affordable and down-to-earth than pricier Boulder just up the road.

Worth knowing

Longmont sits out where the plains meet the foothills, so it doesn't tuck up against the mountains the way Boulder does, and the flip side of that open setting is that St. Vrain Creek runs right through town — the 2013 flood was a hard lesson, so floodplain status is a real thing to check parcel by parcel here. The upside is that the city took that seriously: the Resilient St. Vrain project has been re-engineering the channel and greenway for years, and it's just the trade for an affordable, well-run city with big mountain views and its own utilities.

The practical side

Longmont is a home-rule city that runs its own electric power, water, and NextLight fiber, so many services and rules are set at the city level rather than the county. And with St. Vrain Creek running through the middle of town, floodplain status is a real, property-specific question here.

  • Check the St. Vrain / Left Hand Creek floodplain status for any parcel — the 2013 flood reshaped channels and maps, and the city's Resilient St. Vrain work has been re-engineering the channel and updating floodplain boundaries segment by segment, which affects insurance and permits.
  • Confirm which utilities serve the address: Longmont runs its own municipal electric and broadband (Longmont Power & Communications, including NextLight fiber) plus city water, so utility setup and rates differ from surrounding areas served by Xcel.
  • For a short-term rental, verify Longmont's city STR rules: you need a short-term-rental license plus a sales-and-use-tax license, only Longmont residents with at least 50% ownership can apply, and in some residential zones (R-RU / R-SF) you need conditional-use approval if another short-term rental already operates on your side of the street on your block.
  • Since Longmont is a home-rule city, check city building permits and sales-tax accounts through the City of Longmont directly, not only Boulder County — the city administers its own code and collects its own tax.
Tags: front-rangehome-rule-cityfloodplainmunicipal-utilities

Local notes

More about Longmont

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Money and taxes

A Boulder County value appeal is about the Assessor's value

A Boulder County value appeal challenges the Assessor's number for your parcel, not the whole tax bill, so bring value evidence.

Home and property

Boulder County building permits are for unincorporated property

Boulder County issues building permits only for unincorporated land; homes inside a town go to that town's own office.

Local rules

Boulder County land-use rules apply outside the cities and towns

The Boulder County Land Use Code governs unincorporated land only; a parcel inside a city or town starts with that local code instead.

Money and taxes

Boulder County property tax starts with two offices

Two Boulder County offices run property tax: the Assessor sets value and exemptions, the Treasurer collects payment.

Home and property

A Boulder County basement bedroom starts with egress

A Boulder County basement bedroom needs an operable emergency escape opening, or the window must be torn out and replaced.

Home and property

A Boulder County owner-pulled permit has real limits

An owner who pulls a Boulder County permit must do the work personally or use full-time maintenance employees, not hired helpers.

Water and land

A Boulder County private well starts with a state permit record

A private well's rules live in a state permit, not a county file, so look it up through the Division of Water Resources first.

Sources and review

Where this information comes from

Colorado Porch gives the short version, then points back to the official source for the rule that matters.

Data used
Colorado state and local-rule source set
Last reviewed
June 2026

Use this carefully: Colorado local rules vary by municipality, county, special district, and home-rule jurisdiction. Confirm the address, not just the town name.

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