Fort Collins Pergola Footings

Six holes, give or take, each landing in whatever part of your yard happens to be there. The lawn on top looks uniform and tells you nothing. We've drilled holes ten feet apart in one back yard and found two different situations, one fine and one a pile of loose fill somebody buried during construction.

That gap between what a yard looks like and what it is runs wide in Fort Collins. Newer areas like Rigden Farm, The Landing, and Registry Ridge sit on ground that was cut, moved, and shaped during the build, then dressed with topsoil and sod. Older properties near Old Town carry a hundred years of gardens, sheds, and buried leftovers in the top few feet. The pergola above doesn't care. The holes very much do.

A yard is not one material, it's a stack of them

Pull a clean core out of a typical back yard and you'll read it like sediment. A few inches of topsoil the landscaper spread. Then whatever got respread during grading, which is native soil that was dug, hauled, dumped, and never compacted. Then, eventually, ground that has sat undisturbed a very long time. Only that last layer is worth bearing on.

So depth on a pergola pier is two questions at once. The bottom has to sit below the frost line, at the depth confirmed with the building department, so ice in the soil can't grab the pier and lift it over the winter. It also has to reach material that will carry the load without settling. Those often point to the same depth. When they don't, the deeper one wins, and we learn that in the hole rather than on paper.

Water decides how long the bottom of a post lasts

The other half of what's underneath is where the water goes. Around here that's snowmelt in March, a couple of heavy spring storms, and irrigation from May to September, draining through soil that holds moisture longer than people expect. A pier in a low spot with water pooling around its top is a rot problem waiting to happen, however good the concrete is.

So we finish every pier above the surrounding dirt and shape the top so water runs off. Then the post gets a standoff base that keeps end grain off the concrete, with hardware rated for exterior use. Wood set straight into a hole and packed with dirt fails at the ground line eventually. Every time. That's not a materials debate, it's what happens to lumber that stays wet.

What we confirm before concrete goes in a hole

• Depth measured against the requirement confirmed with the building department
• Utility locates done, with care where irrigation and low voltage lines run
• Loose spoil cleaned out, since concrete on crumbs is concrete on nothing
• No standing water, or the hole gets pumped and rechecked before we place
• Bearing material at the bottom looked at and agreed on, hole by hole
• Steel cage sized and set with cover on all sides, held off the dirt
• Post base hardware set in wet concrete to a template, plumb and in line

Where the post lands, and how the hole changes

Picking a month for the digging

Work backward from when you want shade. Concrete goes in, hardware gets set, and the structure can go up within a couple of days, so holes drilled in April give you a pergola for June without anybody rushing. Fall is genuinely the nicest time for this: dry ground, easy digging, and a lawn that recovers before it goes dormant.

Spring is the season we push back on. A wet April yard ruts under equipment, and sidewalls slough when soil is saturated, which means bigger holes and more concrete than the job needs. Winter drilling happens, with the top of every hole coming out in frozen chunks and protection over the tops afterward. It's slower, and if your date has any give we'll steer you toward drier ground.