Ask around Hilltop about the sundial at Cranmer Park and you'll eventually hear the same complaint: it's wrong by an hour. People have been saying this for decades, usually while standing on the flagstone terrace off Colorado Boulevard between East 1st and East 3rd Avenue, squinting at a shadow that doesn't match their phone. Most walk away assuming the thing is just old and imprecise, a relic that never quite worked right.
That's not what's happening. The sundial isn't broken. It's built with two separate faces, one calibrated for summer and one for winter, and the point in the calendar where you're supposed to switch which side you read from is roughly right now, in the days just after the autumnal equinox. If the shadow looked off to you sometime in the last week, there's a real mechanical reason, and it has nothing to do with the sundial's age.
A Sundial Built With Two Faces
The sundial's gnomon, the raised piece that casts the shadow, is angled at 39 degrees 43 minutes toward polar north. The stone beneath it sits perpendicular to the gnomon at 50 degrees 17 minutes, which makes it parallel to the equator. That precision wasn't decorative. It was calculated so the instrument would be accurate specifically at Denver's latitude and longitude, and the top of the stone carries an inscription telling visitors to read the shadow from one side during summer months and to flip to the reverse face for winter. The physical reason is Earth's tilt: as the planet moves through its orbit, the sun's position relative to the gnomon shifts enough that the shadow lands somewhere different depending on the season, which is why a single fixed face can't stay accurate year round.
That means the confused tourists and the local kids climbing on it for photos aren't reading a malfunctioning antique. They're reading half of a two-sided instrument, usually from the wrong half for whatever month it happens to be.
There's a second layer of confusion that has nothing to do with the face swap. Denver's sundial boss himself, George Cranmer, reportedly liked to point out that the plaza sits just 17 seconds of time east of the 105th Meridian, the line Mountain Standard Time is built around, meaning the sundial was accurate enough in his era to set a wind-up watch by. What Cranmer never had to account for was Daylight Saving Time. A sundial tracks the sun, not the clock, so for roughly eight months of the year it will read an hour behind whatever your phone says, independent of which face you're reading. Between the seasonal face swap and the DST offset, there are two distinct reasons a first-time visitor might think the instrument is wrong, and both are explainable rather than a defect.
The Names Behind the Terrace
The terrace didn't happen all at once, and it wasn't one person's idea stacked on nothing. A few names account for most of what's actually standing there today.
- George Cranmer, the manager of Denver's Parks and Improvements Department, bought a house at the edge of the park in 1926 and set out to build what he described as a country estate in the city.
- Saco Rienk DeBoer, the landscape architect Cranmer hired, designed the formal terraced garden with its fountains and statuary.
- Arnold Ronnebeck, the artist Cranmer commissioned, built the sundial itself out of quartzite quarried in Lyons, Colorado, modeling it after an ancient Chinese design and calibrating it to the site's exact coordinates.
- Patrick Marold, a Denver-based artist working decades later, added the park's newest fixture: a public art installation called BOWS, made of 32 steel arches arranged in a radial pattern that aligns with the cardinal directions and the sundial at the terrace's center.
Denver's Works Progress Administration helped fund the terrazzo terrace and the mosaic mountain panorama etched into it during the 1930s, which is why the plaza still carries labeled outlines of specific peaks along its perimeter, from Longs Peak in the north down to Pikes Peak in the south. Cranmer donated his own house and the surrounding garden to the city in 1937, and the park was renamed in his honor not long after.
Blown Up Once, Rebuilt Twice
The original sundial didn't survive to see its 25th anniversary. In 1965, vandals destroyed it with dynamite, leaving fragments where the stone had stood. Denver's Junior Chamber of Commerce led a citywide fundraising push to rebuild it, and a replica went up the following year, reconstructed from as many of the original pieces as could be salvaged. Vandals struck again in 1992, this time damaging the gnomon specifically, and the community again raised the money to repair it.
The slower threat turned out to be weather. Decades of exposure cracked the flagstones and chipped at the mosaic tiles until Colorado Preservation Inc. listed the sundial plaza as one of the state's endangered historic places, a designation that helped the Save Our Sundial campaign push for repairs. The city launched a restoration project in 2018, funded through grants, bonds, and private donations, and the work finished in 2020 with the terrace reopened to the public.
The people who fought to save it weren't abstract. Alison Koff, a Kent Denver School senior who helped organize a fundraising benefit for the sundial's repair, put it simply when she said she'd lived half a block from the park her whole life and had grown up taking nightly walks there with her parents and sister. That's the version of Cranmer Park that predates any renovation timeline: a terrace people walk to on purpose, not a stop on a tour.
The Newest Layer
For most of its history, the sundial was the only object in the park built specifically to register the turn of the seasons. That changed with Marold's BOWS installation, which was designed so its visual arrangement shifts depending on the time of day, the season, and where the viewer is standing relative to the arches. The steel arches don't tell time the way the sundial does, but they were built around the same idea: that Cranmer Park is oriented, literally, around the sun and the compass.
That's worth sitting with if you've only ever thought of the terrace as a good spot for a mountain photo or a place to let kids climb on the sundial's base. The site was designed from the start to be read against the calendar, first through Ronnebeck's stone, later through Marold's steel. Late September, right after the equinox, is one of the two weeks a year when that design is doing something you can actually catch in the act. Walk up to the terrace this week, check which face of the sundial you're reading, and you'll likely find yourself standing on the exact hinge point between the two calibrations Ronnebeck built in back in 1941.
If you're weighing what a Hilltop address is worth to you beyond the square footage, a park with an 85 year old instrument still doing its job is part of that math. When you're ready to talk through what that's worth in dollar terms, Nick Crothers is a good place to start that conversation.
