Right now, on paper, most Front Range job sites still look like summer sites. But the calendar is closer to winter than it feels. On average, Denver crosses its first freeze of the season on October 7 and sees its first measurable snowfall by October 19, according to National Weather Service climate records for the area. That’s roughly three weeks out from most GCs reading this. The projects that handle the freeze-to-snow transition cleanly aren’t the ones that react well to the first cold snap — they’re the ones that already had a documentation habit in place before it arrived.
Weather delays are one of the few risks on a job site that nobody disputes actually happened. What gets disputed is whether it happened the way the contractor says it did, on the days the contractor says it did, to the activities the contractor says it affected. That gap between “it snowed” and “the snow caused a compensable delay” is where a lot of otherwise legitimate claims lose ground.
What your contract is actually asking you to prove
Most standard contract forms don’t grant a weather extension just because weather occurred. The AIA A201 general conditions require that a weather-based claim be documented by data substantiating that conditions were abnormal for the time of year and could not reasonably have been anticipated. ConsensusDocs uses similar language, tying relief to “adverse weather conditions not reasonably anticipated.” Both forms put the burden on the contractor to show the weather was unusual, not just inconvenient.
The problem, as claims consulting firm Trauner Consulting Services has pointed out in its analysis of weather clauses, is that most contracts never define what “reasonably anticipated” actually means. Without a number attached — a threshold for rainfall, temperature, or snow depth, and how many delay days per month are considered normal — contractors and owners are often negotiating the definition after the delay has already happened, which is the worst possible time to do it. Trauner’s review of well-drafted weather clauses points to models, like Tennessee’s standard state contract language, that spell out anticipated weather days by month and define what percentage of a workday has to be affected, along with whether the delayed activity was on the critical path, before a day counts as an adverse weather day at all.
A 30-year average isn’t your evidence
It’s tempting to settle an argument about “abnormal” weather by pointing at a long-term climate average. Trauner’s guidance specifically warns against this: a 30-year normal describes a typical season, not what happened on your site, on a specific date, during a specific work shift. The stronger approach is a contemporaneous daily record — actual conditions at the site’s location, on the days work was scheduled, compared against what a reasonable schedule would have anticipated for that period. General averages tell you what usually happens. They don’t tell you what a lender, an owner, or a mediator needs to know about this project, this month.
What a notice of delay actually needs to say
Once a weather event has affected the schedule, the contractor’s job is to notify promptly and back the notice with specifics. Guidance from Procore’s construction library lays out three things a notice of delay should include: a short narrative describing what happened and its estimated impact on the schedule, an explanation of the added cost or time being requested, and supporting evidence — weather reports, photos, correspondence, and other documentation from the period in question. A notice submitted without that third piece is an assertion. A notice submitted with it is a record.
Where a dated aerial pass fits into that record
This is the piece that’s hardest to reconstruct two weeks after the fact and the easiest to have on hand if it’s already part of your routine. A drone flight over the site on a consistent schedule captures exactly what Procore’s guidance is asking for: standing water in an open excavation, snow load on an unfinished roof deck, a saturated laydown yard, ice on site access roads — dated, geo-referenced, and independent of who remembers what. Paired with the crew’s daily logs and the nearest weather station’s actual readings, that image turns a general weather complaint into a specific, site-level record tied to a specific date.
This is exactly what Dragonfly Aerials‘ Construction Progress Documentation service is built to provide on a recurring basis. Because the imagery is captured on a standing schedule rather than requested after a dispute starts, it’s already sitting in the project file by the time anyone needs it. That timing matters beyond weather claims, too — on projects where progress documentation feeds a lender’s draw, the pay application is typically assembled on or around the 20th of each month and pro-rated through month-end, so the underlying photos need to be days old, not weeks, to be current when the numbers are built. A flight cadence built around that calendar keeps the record useful for both purposes at once.
Building the habit before the season turns
None of this requires an elaborate system. It requires deciding now, while the weather is still cooperating, what a documented adverse weather day looks like on your project, and putting a recurring aerial flight and a daily log discipline in place before the first hard freeze rather than after it. Our How It Works page walks through what that flight-to-delivery process looks like in practice. Dragonfly Aerials is FAA Part 107 certified, based in Arvada, and delivers standard reporting packages within 2–3 business days of the flight — fast enough that current site conditions are still current by the time you need to reference them.
If your project is heading into the Front Range’s freeze-and-snow season without a standing documentation cadence, now is a smaller lift to set one up than trying to reconstruct what happened after a delay is already being disputed. You can see the full range of documentation services here, or get a quote for your site.
Sources:
https://www.weather.gov/bou/DenverFallWinterStatistics
https://www.procore.com/library/notice-of-delay
https://www.traunerconsulting.com/weather-and-construction-the-contract/