Trailside
By Jessica Carcoana · Updated September 2026
KB Home set the plan mix here: two story and ranch models plus patio homes, 1,700 to 3,100 above grade square feet, some with three car garages and deep yards and others with the yard work handled by the association. The draw is Trail Winds Park and Open Space, a little over 110 mapped acres of ball fields, playgrounds, and trail connections off Holly Street. Trail Winds Recreation Center at 13495 Holly Street adds a climbing wall, an indoor track, a gymnasium, an indoor playground, and a lazy river. Horizon High School stands at 5321 East 136th Avenue, and 136th carries west to I-25 in about ten minutes.
At a glance
Community Anchors
- Margaret Carpenter Park (100 acres, lake, boat rentals, amphitheater, carousel, splash pad)
- Trail Winds Park and Open Space (120 acres, skate park, sports fields, disc golf)
- Trail Winds Recreation Center (indoor pool with waterslides, lazy river, fitness center)
- Carpenter Recreation Center (pools, gym, racquetball, running track)
- Community Park (playground, skate park, tennis, city pool)
- Thorncreek Golf Course (18-hole public)
- Heritage Todd Creek Golf Course (18-hole, semi-private)
- Riverdale Regional Park (1,200 acres, lakes, fishing, trails)
- Denver Premium Outlets
- Thornton Town Center (24-acre shopping center)
- Larkridge Shopping Center (Costco, Home Depot)
- Orchard Town Center (Target, REI)
- 140+ miles of trails and 2,500+ acres of parkland
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Where it sits
Inside Thornton. Approximate area.
Quick answersQuestions about Trailside
Where is Trailside?
Trailside is in Thornton, about 5.4 miles northeast of the Thornton center. The map on this page shows its approximate location.
When was Trailside built?
Homes in Trailside were built between 2014 and 2018 (early 21st century / new build). Builders on record include KB Home.
Is there an HOA in Trailside, and what does it cost?
Trailside has a homeowners association. Dues run about $40–$60/mo (estimated); confirm the current figure with the association before you buy.
What amenities does Trailside have?
Trailside amenities include proximity to 120-acre Trail Winds Park and Open Space, disc golf course nearby, hiking and biking trails, and community-maintained yards on patio-home models.
How big are the lots in Trailside?
Typical lots in Trailside run 0.08–0.18 acres.
Which schools are near Trailside?
Schools near Trailside include Adams 12 Five Star Schools and Horizon High School. Verify enrollment eligibility by address.
What is the nearest light-rail station to Trailside?
How high is Trailside?
Trailside sits at about 5,220 feet above sea level.
Parks and Schools
- Trail Winds Park and Open Space
- Adams 12 Five Star Schools
- Horizon High School
Verify school assignment by address with the district. Attendance boundaries do not follow neighborhood lines.
Commute and Access
- 10 minI-25
- Holly St (adjacent)
- E 136th Ave
Transit in Thornton: RTD N Line commuter rail, Original Thornton/88th Station, Thornton Crossroads/104th Station, Eastlake/124th Station (current terminus) · Future N Line extension to 144th/York and North Thornton/Hwy 7 · RTD bus routes along Washington St, 104th Ave, 120th Ave corridors · Flex Ride on-demand transit in select zones
Other Neighborhoods in Thornton
About This Profile
This profile of Trailside was researched in April 2026. It was last reviewed in September 2026. The price range is an estimate built from comparable nearby neighborhoods rather than from direct listings. Amenity coverage is moderate, and some features rest on a single source. Subdivision name absent from county plats; placement inferred from its park and school anchors.
Data sourced from direct and indirect online resources. Details are subject to change over time as we continue to research this area.