Snow load is the number that changes a Colorado chicken coop, and it changes with elevation: Larimer County’s published table runs from 55 psf of ground snow at 5,000 feet and below to 95 at 7,000 and 160 at 9,000, with a minimum roof design load of 35 psf. Our plans do not state a design snow load, so the roof is the part of any of them that your own building department should look at.
We read one county’s code, Larimer County’s 2024 structural amendments, updated January 2026. Other Colorado jurisdictions publish their own values, so treat the numbers below as an example of how much they move and check yours.
What a Colorado jurisdiction publishes
Larimer County lets the 2024 IRC prescriptive rules apply where ground snow load does not exceed 70 psf and ultimate design wind speed is below 140 mph, and sends everything else to engineered design. Its ground snow load table, in pounds per square foot, by elevation the site does not exceed:
| Elevation | Ground snow load |
|---|---|
| 5,000 ft | 55 psf |
| 6,000 ft | 70 psf |
| 6,500 ft | 80 psf |
| 7,000 ft | 95 psf |
| 8,000 ft | 110 psf |
| 9,000 ft | 160 psf |
At or above 10,000 feet the county sends you to the state snow load report and map. The final design roof snow load is never below 35 psf. Frost depth is 30 inches countywide. Two things follow. A coop at 6,000 feet sits at the edge of the county’s prescriptive limit, and one at 7,000 is past it. And the “Colorado snow load” a neighbor quotes you may be for a different elevation or a different county.
What our roofs are
Pitch is the part of the snow story that our own data can answer. Thirteen of our chicken coops are single-slope at 3:12, which is also the minimum Robertson lists for exposed-fastener corrugated panels. Four have gable roofs at 12:12: the 4x4, the 4x6, the 6x8 coop and the 8x12 coop. A steeper roof sheds snow more readily than a shallow one, but we do not have a 4:12 or 6:12 single-slope drawn, and the books do not state what snow load the 2x6 rafters were checked against. If you want a Colorado roof built to a stated load, take the plan to your building department or an engineer and let them change the rafters, because we cannot tell you a number. The roof guide covers panels and fasteners, and the permit guide covers who decides.
If snow shedding matters more to you than anything else, the steeper gable is the closest thing we draw: the 8x12 chicken coop has a 12:12 roof, 80 sq ft of floor, 12 to 19 hens, 24-inch floor clearance and $3,950 to $5,050 in materials. It has no feed room.
Foundations and frost
Our coops stand on solid concrete deck blocks set on compacted gravel, not footings below frost depth. Larimer County puts frost depth at 30 inches. A light accessory structure on blocks will move with the ground if the ground heaves, and whether your building department accepts that on a coop of this size is a question for them. The lean-to’s Mount B posts, which go 30 inches into the ground, are the one place a plan of ours sets anything to that depth.
Cold and moisture: where the insulated coop fits
Cold is a smaller problem for the birds than wet. The 8x12 insulated coop is the plain 8x12 walk-in with an envelope added: R-13 batts, wall sheathing, a ceiling liner and a ventilated roof channel. It costs $5,500 to $7,100, $1,250 to $1,650 more than the plain coop, and takes 78 to 98 hours. It has 58 sq ft of floor and a 128 sq ft run for 14 to 18 hens, so at 14 birds that is 4.1 sq ft of floor each and 9.1 of run.
Its vent is 5.1 sq ft, exactly the plain coop’s, on purpose. The plan page cites University of Kentucky for insulation’s job being to keep surfaces above the dew point and University of Minnesota Extension for frostbite being a moisture problem as much as a cold one. Insulation removes none of the moisture 18 birds put into the air, so the vent stays open. Poultry.extension.org says the same thing in plain terms: in winter the fresh air brought in should be just enough for adequate exchange, which is a reason to size and place openings, not to close them. The plan skirts the shaded bay under the floor with removable panels from November to April, so it is seasonal space in a cold state. See the insulation guide and the cold-climate plans guide for the layers.
If you do not need the insulation, the 8x8 walk-in is 51 sq ft of floor and an 80 sq ft run for 10 to 13 hens at $3,200 to $4,100. At ten hens that is 5.1 sq ft of floor and 8 of run each,, with 40 to 52 hours of work.
Local rules
Front Range cities publish their own rules for how many hens, where a coop can sit and whether a permit is needed, and the summaries we found online do not agree with one another. We are not publishing a table. Read your city’s code, check your HOA, and ask your building department the snow question above. UF/IFAS’s advice for any state applies here too: check planning and zoning, or municode.com.