3817 E 121st Ave, Thornton, CO 80241
OFF MARKET

3817 E 121st Ave
Thornton, CO 80241

  • 2 Beds
  • 1.5 Baths
  • 1,680 sqft

$368,400

Trulia Estimate
as of Jun 29, 2026
Est. Refi. Payment $2,071/mo*
Refinance Your Home

$368,400

Trulia Estimate
as of Jun 29, 2026
Est. Refi. Payment $2,071/mo*
Refinance Your Home
2 Beds
1.5 Baths
1,680 sqft

Local Information

  • Map ViewExplore the area around 3817 E 121st Ave.
  • Schools1 Elementary School1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Description

This end-unit, two-story townhome has the feeling of a single-family residence with an open layout, private deck, and basement. The main floor flows seamlessly from a family room with a fireplace to the dining area and into a spacious kitchen with stainless steel appliances. A half bath is also found on the main floor. The upstairs includes a roomy master bedroom with a large walk-in closet, a full bath with custom tile work, and a second bedroom with a walk-in closet. The basement is unfinished and includes a washer and dryer. There is an attached one car garage with a second uncovered parking space and access to plenty of additional guest parking. The rent amount includes the monthly HOA fee. Renter is responsible for water, gas, electric, and internet. No smoking allowed. Dogs up to 50 pounds permitted. Located near the N-line light rail station, trails, elementary school, and Eastlake Shores Park. Easy access to E-470 & I-25. Background/credit check required.

The rent amount includes the monthly HOA fee. Renter is responsible for water, gas, electric, and internet. No smoking allowed. Dogs up to 50 pounds permitted.
This property is off market, which means it's not currently listed for sale or rent on Trulia. This may be different from what's available on other websites or public sources. This description is from August 14, 2025

Home Highlights

Parking
Attached Garage
Outdoor
No Info
A/C
Heating & Cooling
HOA
None
Price/Sqft
No Info
Listed
180+ days ago

Home Details for 3817 E 121st Ave

Interior Features

Heating & Cooling
Heating: Forced AirAir ConditioningCooling System: Central AirHeating Fuel: Forced Air
Appliances & Utilities
DishwasherDryerMicrowaveRefrigeratorWasher
Levels, Entrance, & Accessibility
Floors: Carpet, Hardwood

Property Information

Property Type / Style
Property Type: Townhouse

Rental Terms, Policies & Fees

Lease Term: Sublet/TemporaryAvailable: now

Exterior Features

Parking & Garage
Parking: Attached, On Site

Price History for 3817 E 121st Ave

DatePriceEventSource
03/23/2020$300,000Sold
N/A
02/13/2020$299,000PendingAgent Provided
01/30/2020$299,000PendingToActiveAgent Provided
01/27/2020$299,000PendingAgent Provided
12/12/2019$299,000Listed For SaleAgent Provided

Market trends in Thornton

Last updated May 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$484K
$1.67KMoM
Sale-to-List Price
100.0%
Price per sq ft
$235
$2MoM
Available listings
511
42MoM
Skip to last item
  • Results are loading
Skip to first item

Property Tax and Assessment

Year2025
Tax$2,339
Assessment$376,000
Home facts updated by county records

Comparable Sales for 3817 E 121st Ave

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
3989 E 121st Avenue, Thornton, CO
0.09
Townhouse
$374,000
01/23/26
3
2
1,484
11928 Monroe Street, Thornton, CO
0.30
Townhouse
$287,000
01/06/26
2
1.5
1,178
12444 Madison Way, Thornton, CO
0.30
Townhouse
$475,000
08/29/25
2
2
1,448
4135 E 119 th Place #B, Thornton, CO
0.44
Townhouse
$355,000
01/23/26
2
2
1,428
3595 E 124th Place, Thornton, CO
0.36
Townhouse
$491,000
07/30/25
2
2
1,448
11909 Monroe Street, Thornton, CO
0.35
Townhouse
$285,000
04/09/26
2
1
951
4060 E 119th Place #A, Thornton, CO
0.50
Townhouse
$375,000
09/22/25
2
2
1,757
4160 E 119th Place #A, Thornton, CO
0.51
Townhouse
$364,700
04/09/26
2
2
1,757
4220 E 119th Place #A, Thornton, CO
0.55
Townhouse
$358,000
10/16/25
2
2
1,682
4220 E 119th Place #B, Thornton, CO
0.55
Townhouse
$336,900
03/03/26
2
2
1,428

Nearby homes

Get a sense of prices in the area by checking nearby homes.
Skip to last item
Skip to first item

Assigned Schools

These are the assigned schools for 3817 E 121st Ave.
View nearby schools on GreatSchools
The GreatSchools Rating compares schools on a variety of school quality indicators including test scores, college readiness, equity and more. Learn more.

What Locals Say about Thornton

At least 717 Trulia users voted on each feature.

  • 91 % Say there are sidewalks

  • 89 % Say it's dog friendly

  • 85 % Say car is needed

  • 80 % Say parking is easy

  • 74 % Say kids play outside

  • 73 % Say yards are well-kept

  • 73 % Say there's holiday spirit

  • 67 % Say streets are well-lit

  • 61 % Say it's quiet

  • 58 % Say people would walk alone at night

  • 55 % Say there's wildlife

  • 54 % Say it's walkable to grocery stores

  • 50 % Say neighbors are friendly

  • 50 % Say they plan to stay for at least 5 years

  • 43 % Say it's walkable to restaurants

  • 28 % Say there are community events

Sourced by Trulia users. Learn more about our methodology.
  • Jessica Johnson
    "Not to many people are smart with their dogs. Thinking they can be off lease when they can’t. Just beware"
    0
    Flag
  • Tammy Ralston
    "Very well maintained areas nice parks with playgrounds as well as open spaces. We live in a newer part of Thornton so food is a little farther away but in about 10-15min you’re on the 25 then you can head anywhere."
    0
    Flag
  • Antonio Gonzalez
    "I drive to Aurora near Buckley for work, it takes about an hour. Freeway use is the only way to get anywhere out of Thornton quickly."
    0
    Flag
  • Hooligancats
    "There are lots of friendly dogs in the area and the owners are super nice. Lots of dog walking too. "
    0
    Flag
  • Trulia User
    "Tree’s neighborhood & people the stores around us , the amount of places u can go to & the amount of food selections u can choose from is great lots of Mexican and mix of other types of restaurants!"
    0
    Flag
  • Sarah Vargas
    "Dog owners would like the way people treat the dogs and the way dogs treat the people in this neighborhood "
    0
    Flag
  • Miguel Gutierrez
    "Happy to live in Thornton great friends and great neighbors. Great with the ROI over the years. I recommend it"
    0
    Flag
  • Jason.barrios
    "Elementary and middle schools are right in the neighborhood. A golf course runs through the neighborhood and is a municipal course."
    0
    Flag
  • Lariza.cantu
    "I love my neighborhood. Thornton as a city does a really good job at holding community events that help develop a sense of community and pride."
    0
    Flag
  • Jnburg17
    "I really don’t like the area. Lots of crime and it’s very uncomfortable. There are some nice parks in the area that are nice but you have to watch your back at all times. "
    0
    Flag
  • Jnburg17
    "So much crime! It’s so hard to feel safe or that your property is safe. It will be a blessing when we are able to get out of this city or state!"
    0
    Flag
  • Danafarnham
    "The neighborhood is unique because of the birds that inhabit it. We have owls and bald eagles. We often get the Eastlake turkeys that pay a visit. "
    0
    Flag
  • Anchandra14
    "Annual community gathering, safe area, not crowded, good neighborhood, good libraries, good school, near hospital."
    0
    Flag
  • Trulia User
    "It’s a great quiet culdesac. We enjoy our neighbors and the paths to walk on with our pets. Packages are safe "
    1
    Flag
  • Betsyjoy
    "Thornton Winter Fest at recreation center at 112th and Colorado Blvd. Adams County Fairgrounds 4th of July fireworks."
    0
    Flag
  • Jason.barrios
    "Long to get to Tech center on south side of city. Commute to downtown is 15 minutes. Commute in north is easy."
    4
    Flag
  • Purplegirls_3
    "i drive my car everywhere and lots of convenient shopping malls around the neighborhood. Easy access to 470 and 1-25 also back roads if not wanting to use the tolls. great community! "
    0
    Flag
  • Dawnnicastro
    "People are friendly, and it’s a safe place to live. People are out walking their dogs a lot. It’s relatively quiet and pretty peaceful around here. Streets are well lit, and sidewalks/roads are in good shape."
    0
    Flag
  • Baylion22
    "It’s quiet regardless of how many cars there are it’s peaceful, no loud music just crickets and birds. It’s as if the entire neighborhood is problay full of elderly hence why there are no loud noises not even at night. You may hear a car burn out if your outside from afar but that’s bout it. I see no other reason not to live here. I haven’t heard of any robins or killings in the area or gunshots, and no people using illegal drugs either."
    0
    Flag
  • Lluvia L. D.
    "Any breed is welcome, it’s very much a dog loving neighborhood. Always see dogs walking, most people pick up after their dogs"
    1
    Flag
  • Shalon R.
    " I love how close I am to multiple malls, stores, shopping center etc . Thornton is close to boulder for a easy hike and Denver for a night downtown . "
    0
    Flag
  • Sarah S.
    "Lots of places to roam. Good area. Fun for family and pets. Northglenn is great as well. Adcbhyggkoifd"
    0
    Flag
  • Vanessa R.
    "Is very Quite, family friendly and great neighbors. Lots of trails for entertainment and good local restaurants "
    1
    Flag
  • Jennifer W.
    "Nice, friendly neighborhood. Close to store and restaurant. Several parks in area for kids. Walking distance to schools."
    1
    Flag
  • Yamilet S.
    "Very good and clean quiet area. Very nice people around always quiet in the neighborhood never any bad experiences "
    0
    Flag
  • Doger96
    "Newer, nice but private neighbors. Clean not alot of threw traffic. Nice mix of families and young couples."
    0
    Flag
  • Sandra O.
    "Very safe and well maintained. I am a fan of the neighborhood kids being able to play outside and feel safe doing so. In any case I appreciate and love living in Thornton "
    2
    Flag
  • Kmgriff
    "Very dog friendly. Lots of trails around and good dog parks. The neighborhood has many friendly dogs "
    0
    Flag
  • Vbsierra15
    "Please Watch out for wild animals at dusk. I’ve seen multiple foxes and coyotes in our neighborhood. "
    1
    Flag
  • Ky H.
    "Has great access to public transportation. About 25 minutes to downtown .I-25 traffic could be crazy at times so try to avoid the peak hours ."
    0
    Flag
  • Alfred P.
    "I am 3blocks from I25 @ 120th. This is the easiest spot to start any journey around town. Food of all kinds can be found in the neighborhood."
    0
    Flag
  • Dia.boss1313
    "Everyone loves their doggies . As long as you don’t mess with me doggie I won’t mess with chores . Lol :)"
    0
    Flag
  • Krystal K.
    "so far we like it. neighbors are kind and maintain the property, I love the school district and it's a shorter commute to Denver."
    0
    Flag
  • Mercedes
    "A gazillion miles away from anything. There's transit but the routes are awful. The neighbors seem friendly, but are extremely stand off-ish when it comes to newbies in the community. Otherwise it's a cute community. "
    0
    Flag
  • Tdrago111
    "Like everywhere else in Colorado. Annoying and slow. so many people coming here and making more traffic. But great if you like to listen to music while you are being slowed down on the road. "
    0
    Flag
  • Brina E. D.
    "I'm not that involved in the community to be able to tell you what makes it special. Personally, this part of Thornton is not somewhere I would suggest living. "
    0
    Flag
  • Danny A.
    "Get to know the area around you want to live first. the are good parts and not so good parts. There is a lot of people that move here and like it here."
    0
    Flag
  • Kay W
    "A lot of neighbors are very active with their dogs. There is a lot of open space and trails to walk your dogs."
    0
    Flag
  • Abe B.
    "Trunk or Treat for Halloween. Thornton Fest in early summer. 4th of July fireworks show which is very unique. Pirate Fest in early autumn, at Webster Lake. Numerous Xmas lights all over the place, most notably, what my family has dubbed "The Box House", on Pecos St, just north of 100th. Numerous fireworks shows all over for New Year's. "
    0
    Flag
  • Mattnarielle
    "The neighborhood I live in is not to bad. However if you have kids it’s always best to make sure they are in by 10 since there is some suspicious characters."
    0
    Flag

LGBTQ Local Legal Protections

Apartments for Rent

Skip to last item
Skip to first item

Explore by feature - Pet Friendly

147 pet-friendly rentals in Thornton, CO

Explore by feature - Garage

120 rentals with a garage in Thornton, CO

Explore by feature - Air Conditioning

172 rentals with air conditioning in Thornton, CO

Explore by feature - Pool

87 rentals with a pool in Thornton, CO

Explore by feature - Washer/dryer

176 rentals with a washer/dryer in Thornton, CO

Explore by feature - Outdoor Space

46 rentals with an outdoor space in Thornton, CO

Homes for sale near 3817 E 121st Ave

Skip to last item
Skip to first item

Off Market Homes Near 3817 E 121st Ave

Skip to last item
Skip to first item
3817 E 121st Ave, Thornton, CO 80241 is a 2 bedroom, 2 bathroom, 1,680 sqft townhouse. This property is not currently available for sale. 3817 E 121st Ave was last sold on Mar 23, 2020 for $300,000 (12,943% higher than the asking price of $2,300). The current Trulia Estimate for 3817 E 121st Ave is $368,400.