Photo Credit: Lennar Multifamily Communities
Nice to meet you
Back40 is a boutique landscape architecture firm based in Denver, Colorado.
We believe outdoor experiences are as important as indoor spaces.
We design beautiful places with smart technologies.
We solve problems through design and innovation.
We integrate sustainable practices to promote local and global impact.
We understand how to get projects built.
We create value for our clients and our community.
How we work
Creativity. Collaboration. Cranking hard until it’s right.
Get in touch for specifics on our diverse project experience.
























Form is only as good as its function. Our design style brings unique vision, authentic teamwork, cutting-edge technology, and get-it-done pragmatism to every project.
We do what it takes to exceed expectations and build lasting relationships.
Who we are
Years of experience. A fresh perspective.

William Bowen & Nathan Krohn
We are Bill and Nathan, long-time colleagues, collaborators, and friends. We think landscape architecture should be more agile, more inspired, with less overhead and greater passion. So long, status quo. Welcome to truly client-centric design.
What we do
Experience you can count on.
We are proud of all our work and strive to reach the best solutions for each design opportunity. We hope you enjoy looking through our work as much as we enjoyed designing these projects!
What we use
A technology toolkit you can trust.










What clients say
A business built on lasting relationships.
“Since 2008, Bill has been an instrumental member of five large-scale multifamily communities we have developed. His work has resulted in a resident experience that is unmatched by other comparable communities. Our outdoor environments, under his design direction, are an integral part of our brand and have proven to be a primary reason for resident retention.
In addition to his thoughtful design, Bill consistently adds to the collaborative culture we hope to have amongst our design teams on all new projects. From concept, through entitlements, through construction documentation and construction administration, Bill is always engaged and consistently anticipates what is ahead to make for a very thorough and well-documented process.
On top of his contributions as a landscape architect, he is just a solid human being who is always a pleasure to share time with. As much as we want Bill all to ourselves, all thoughtful developers deserve to experience his contributions to your communities. We look forward to many more successful developments with Bill in the future.”
– Scott Johnson, Division President Mountain States / Southwest, LMC, a Lennar Company
I worked with Nate professionally and brought on the Back40 team to design the site of our lake home in Okoboji. The site was challenging and it amazed me the thoughtfulness and creativity shown in each concept they developed. They went above and beyond, and the hardest part of working with them was narrowing down the concepts to which one we wanted to build. Each design was inspiring and representative of what could actually be built as a retreat for our family. They illustrated beautiful ways to extend the living spaces beyond the walls of the home to maximize our investment in this property. As landscape architects, they provided strategic insight that influenced the siting of the home, and ensured the architectural features aligned with exterior site conditions and larger design gestures. We have really enjoyed working with them and seeing their pure talent and passion for beautiful design.
– Heather Tomasek, Park Planning and Design Coordinator, City of Council Bluffs, Iowa
“It has been an absolute pleasure to work with Bill and the Back40 team! Bill is a tremendous asset to every project, adding insight, creativity, and a willingness to challenge the status quo. Although the design and execution is top notch, the real quality Bill brings is fortitude. I ask a lot of consultants and Bill stuck with me every step of the way, embracing the challenge with a smile. I would happily drag Bill through the trenches with me in any future project!”
– Tyler Erickson, Development Manager, McWhinney
“I have worked with Bill on several projects in Denver over the past few years. Bill was the project manager and designer for all the projects as well as our daily contact while completing the work in the field with our general contractor. During the design phase, it was obvious to me that Bill not only had creative design ideas but also understood how we were going to build the project. He worked closely with all consultants to coordinate the landscape design and scope, always providing a complete GMP pricing proposal.
If questions arose in the field from contractors, he was available to be on site and meet with the trades, providing answers or working through alternative design solutions. Bill understands what is constructible in the field and can easily explain the design vision and documentation to the subcontractors. I recommend him as a consultant on all types of projects, especially the complex high-end urban multi-family developments I have worked with him on in the Colorado market.”
– Eric Entlich, Project Manager, Continuum Partners
“Tryba Architects collaborated with Bill Bowen in his role as a project manager and designer for studioINSITE on projects including Market Center and 1551 Wewatta. Each of these projects had particularly challenging landscape conditions with the conversion of an existing roof into an elevated garden and complex, multi-leveled streetscape improvements to the public realm.
Bill’s combination of design skill and technical knowledge was critical to the successful delivery of these projects. His collaborative and communicative approach to design made working with him a highly enjoyable and effective process. We look forward to the opportunity to work with him again.”
– John McIntyre ANZIA, International Assoc. AIA, Principal, Tryba Architecture
“I’ve worked with Bill Bowen for over five years and I continue to be impressed by his creativity. As a civil engineer, it’s always fun working through new challenges and teaming with a landscape architect who also understands the civil engineering design constraints that must be solved. I’m constantly amazed by his ability to provide unique and successful designs while also meeting the jurisdictional code restrictions. I would not hesitate to recommend Bill and his team.”
– John O’Rourke, PE, HKS (Harris Kocher Smith)
Stay updated
The latest at Back40.
Our team is growing! Meet Ashley.
Let’s get started
back forty: a remote and uncultivated or underutilized piece of land

At Back40, we see the potential in every site and every project. How can we bring the most to your investment?






