Thornton Self Storage - 3685 East 121st Avenue, Thornton, CO 80241

4/5 - 88 Reviews
Location:
3685 East 121st Avenue, Thornton, CO 80241
Office hours:
  • Mon-Thu: 8:30 a.m. - 5 p.m.
  • Fri: 8:30 a.m. - 6 p.m.
  • Sat: 8:30 a.m. - 5 p.m.
  • Sun: 8:30 a.m. - 1 p.m.

Thornton Self Storage - 3685 East 121st Avenue, Thornton, CO 80241

  • Climate-Controlled

    Protect belongings from temperature changes and humidity

  • Indoor

    Units are located indoors for added protection and convenience

  • Drive-Up Access

    Drive directly up to your unit for easy loading and unloading

    Not sure which size you need? Check our size guide to find the perfect fit.
    5x15 Self Storage 75 Sq. Ft.
    $124/mo
    5x10 Self Storage 50 Sq. Ft.
    Climate-Controlled
    $99/mo
    5x10 Self Storage 50 Sq. Ft.
    $94/mo
    5x5 Self Storage 25 Sq. Ft.
    Climate-Controlled
    $64/mo
    5x5 Self Storage 25 Sq. Ft.
    $59/mo
    10x15 Self Storage 150 Sq. Ft.
    $189/mo
    10x10 Self Storage 100 Sq. Ft.
    Climate-Controlled
    $154/mo
    10x10 Self Storage 100 Sq. Ft.
    $149/mo
    5x20 Self Storage 100 Sq. Ft.
    $134/mo
    15x25 Self Storage 375 Sq. Ft.
    $289/mo
    15x20 Self Storage 300 Sq. Ft.
    $259/mo
    15x15 Self Storage 225 Sq. Ft.
    $239/mo
    10x25 Self Storage 250 Sq. Ft.
    $259/mo
    10x20 Self Storage 200 Sq. Ft.
    $229/mo
    No units are currently available.

    Amenities & features

    • Climate-Controlled
    • Indoor
    • Drive-Up Access
    • Retail Available
    • Onsite Manager
    • Truck Rentals
    • Security Camera
    • Gate
    • Credit Cards Accepted

    Customer reviews

    4/5
    Average rating
    88
    Number of reviews

    Read some helpful reviews of Thornton Self Storage, shared by real renters with genuine experiences and honest opinions.

    Conner B. - 6 June 2026
    John M. - 29 September 2025
    Worst place ever they took my money and then said they didn't ..plus they screwed up by giving me an indoor unit when I asked for a drive up. Plus the area on E. 121st Ave is really a shady place... because the area isn't the best place to go by yourself even during the daylight... I never used the facility because of the mistake of the inside unit, and they said they don't give refunds for any circumstances...what a crappy way of doing business...when they messed up!! ... Read more
    Paula Y. - 4 January 2025
    I run a local small business and I have had to make storage reservations as well as rent U-Hauls all over Thornton, Northglenn, Broomfield, Westminster etc - This is by far THE BEST location I work with. I highly recommend - John is very helpful and the owner Alex Is as well. Plus they have a cool shop inside. 5 of 5 good job ... Read more
    Captain A. - 28 October 2024
    This place will most likely try to scam you like they did with me. Be careful. Paid twice the amoumt I agreed upon, with a second charge a day later. There's so many U-Haul dealers! Go somewhere else !! ... Read more
    Mike R. - 11 August 2024
    Called to get an estimate for a 10x15 or 10x20 and the first person that answered phone was the most disrespectful person I have ever met and couldn’t figure out basic math and when asked for a manager he came up with 45 seconds worth of every reason to not place me on hold til a manager was available. Once I address again I wanted to speak to a manager I heard the first line person yelling and screaming at the manager about the situation and I address I wanted to make sure I had enough money available at the time the owner gave me rough estimate….. I’d never go threw the first person if it was the last storage place in Colorado ... Read more
    Chris M. - 7 August 2024
    Great storage for a reasonable price and convenient to rent and return the u-haul truck I used for the transition. Had to store my things for longer than expected, but that was no issue and I experienced no raise in rates while I needed my unit! ... Read more
    Derek “. - 6 June 2024
    Karen F. - 12 August 2023

    About this facility

    Located at 3685 East 121st Avenue in Thornton, Colorado, this Thornton Self Storage facility offers a variety of unit sizes to meet your needs, ranging from small to large. Whether you're storing seasonal gear, household items, or larger possessions, there's a solution for nearly every storage requirement.

    For added convenience and protection, this facility features climate-controlled units, which are ideal for safeguarding your belongings from Colorado's fluctuating temperatures and dry air. The drive-up access makes loading and unloading straightforward, while indoor units provide added protection from the elements. Safety is a top priority, with security cameras monitoring the premises and an onsite manager ensuring extra peace of mind.

    This location also offers retail moving supplies and truck rentals, making your moving process more seamless. With the ability to reserve and pay using credit cards, this Thornton Self Storage facility is a great choice for residents in Thornton looking for secure, accessible, and convenient storage solutions.

    Price comparison

    See how this facility's unit prices compare to others in Thornton, broken down by size.

    Small $88/mo
    Location minimum Location maximum
    $55/mo $172/mo
    Medium $157/mo
    Location minimum Location maximum
    $134/mo $250/mo
    Large $255/mo
    Location minimum Location maximum
    $127/mo $609/mo

    Location & walkability

    This storage facility is in an area with moderate walkability and some public transit options. A personal vehicle may be needed for certain trips.

    47

    out of 100

    Walk Score

    Car-Dependent

    Most errands require a car

    26

    out of 100

    Transit Score

    Some Transit

    A few nearby public transportation options

    49

    out of 100

    Bike Score

    Somewhat Bikeable

    Minimal bike infrastructure

    Walk Score®: 47, Transit Score®: 26, Bike Score®: 49

    Neighborhood highlights

    Located near shopping, car wash stations, and other local conveniences, this storage facility helps you make the most of every visit.

    • JJs Wine and Spirits

      Shopping 0.11 miles

    • Appliance Service Inc

      Shopping 0.11 miles

    • Rent-A-Center

      Shopping 0.12 miles

    • Andy's Laundry

      Shopping 0.12 miles

    • Sprint

      Shopping 0.12 miles

    • The UPS Store

      Services 0.14 miles

    • Las Palmas

      Food & Drinks 0.16 miles

    • South Philly Cheese Steaks

      Food & Drinks 0.17 miles

    • Domino's

      Food & Drinks 0.18 miles

    Frequently Asked Questions

    The right storage unit size depends on what you plan to store and how much space you need to move around your items.

    5x5 or 5x10 units are great for smaller loads, such as chairs, lamps, small furniture pieces, boxes, books, and documents.

    10x10 or 10x15 units work well for larger furniture, bicycles, appliances, and the contents of a small apartment.

    10x20 or 10x30 units can typically fit the contents of a three-bedroom home, including large furniture and multiple appliances.

    If you’re unsure which size is best, a unit size calculator can help estimate the right fit based on the items you’re planning to store – helping you avoid paying for more space than you need.

    Climate-controlled storage units maintain consistent temperature and humidity levels, helping protect items from damage caused by heat, cold, or excess moisture.

    You may want climate control if you’re storing items that can be sensitive to temperature changes, such as furniture, clothing, appliances, paperwork, photographs, artwork, electronics, or wood and leather goods. These units are especially useful for long-term storage or in areas with hot summers, cold winters, or high humidity.

    If you’re storing durable items like tools or outdoor gear, a standard unit may be sufficient. When in doubt, climate control offers added protection and peace of mind.

    The facility at 3685 East 121st Avenue is accessible during regular access hours, typically Mon-Thu: 8:30 a.m. - 5 p.m., Fri: 8:30 a.m. - 6 p.m., Sat: 8:30 a.m. - 5 p.m., Sun: 8:30 a.m. - 1 p.m. Office hours and gate access times may differ, so it’s a good idea to check the facility’s posted schedule before your visit.

    To open your storage unit door, start by unlocking it, whether it uses a traditional padlock or a Bluetooth-enabled smart lock. Once unlocked, grab the bottom handle and lift or pull up the roll-up door until it’s fully open.

    If you’re using the unit for the first time, make sure the lock is properly removed before opening the door to avoid damage.

    Security helps protect your belongings while they’re in storage and gives you peace of mind between visits. Many self storage facilities use a combination of features such as video surveillance, gated access, on-site management, and well-lit premises to help deter unauthorized access.

    At Thornton Self Storage - 3685 East 121st Avenue, available security amenities may include Security Camera, Gate, Onsite Manager, designed to help keep your items protected.

    Yes, most standard vehicles can be stored in self storage units. A 10x20 unit typically provides enough space for a car, while outdoor or designated parking areas may be available for larger vehicles.

    For safety reasons, most self storage facilities restrict certain items. These commonly include:

    • Hazardous, flammable, or toxic materials
    • Perishable food
    • Live plants or animals
    • Cash, firearms, or irreplaceable valuables

    Always check with the facility at 3685 East 121st Avenue for specific restrictions and recommendations.

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