Key numbers
62 verified hail storms with stones of 1.75 inches or larger reached Douglas County from 1991 to 2026 in the storm records we keep; the largest measured 4.25 inches (grapefruit size) on June 10, 2010 (NOAA NCEI).
| Hail storms by decade, 1991 to 2026 | 1990s: 1, 2000s: 26, 2010s: 25, 2020s: 10 Source: Storm library: Denver metro hail history |
|---|---|
| Largest hail | 4.25 in. (grapefruit), June 10, 2010 Source: NOAA NCEI |
| Costliest hail storm | $767.6 million insured losses (2009 dollars), July 20, 2009 Source: RMIIA |
| 73.4% | 73.4% of Douglas County's housing units were single-family detached homes in 2020-2024. Source: U.S. Census Bureau, American Community Survey 5-Year Estimates, 2020-2024 |
A storm counts when the library lists Douglas County among the areas it hit. Each hail size is the storm's largest report, which may have fallen in a neighboring county, and insured losses cover every area the storm hit.
Hail history by ZIP (NOAA reports since 1996; linked ZIPs have a full page, method)
| ZIP | Area | 1 in.+ reports | Largest |
|---|---|---|---|
| 80134 | Parker | 48 | 3 in. |
| 80138 | Parker | 47 | 2 in. |
| 80116 | Franktown | 31 | 1.75 in. |
| 80104 | Castle Rock | 30 | 1.75 in. |
| 80118 | Perry Park | 25 | 2 in. |
| 80126 | Highlands Ranch | 21 | 1.75 in. |
| 80108 | Castle Pines | 13 | 2 in. |
| 80135 | Roxborough Park | 10 | 2 in. |
| 80109 | Castle Rock | 9 | 2.5 in. |
| 80125 | Roxborough Park | 6 | 1 in. |
| 80129 | Highlands Ranch | 6 | 1.5 in. |
| 80124 | Lone Tree | 5 | 1.25 in. |
| 80130 | Highlands Ranch | 2 | 1 in. |
| 80131 | Louviers | 1 | 1.25 in. |
Local building code: Douglas County (unincorporated) roof code data: IRC edition, reroof permits, ice barrier
In Douglas County, the first roofing question is which building department covers your address. The Douglas County Building Division issues permits only for unincorporated areas, which include Highlands Ranch. Incorporated towns run their own: the Town of Parker has its own Building Division, the Town of Larkspur issues permits inside its town limits through SAFEbuilt, and Castle Rock has its own rules. Each office sets its own inspection steps, so a roof that passes in Highlands Ranch is checked differently a few miles away in Parker.
Unincorporated Douglas County rules
The county’s Building Division page spells out its reroof rules:
- Permit threshold. No permit for minor repairs or less than one square (100 sq ft). Each separate structure needs its own roofing permit, except one-story detached accessory structures up to 200 sq ft.
- Inspections. A final inspection on every roofing permit. A mid-roof inspection only for tile, slate, stone-coated steel and similar systems, done at 25 to 50 percent complete, and work may not go past 50 percent until it passes.
- Ladder. The permit holder provides a secured ladder.
- Shingles. One layer only, no overlays. Wind rating 90 mph Class D at or below 7,000 ft, 120 mph Class G above it.
- Ice barrier above 7,000 ft. Drip edge at least 4 by 2 inches on eaves.
- Load. Roof systems may not exceed 600 lbs per 100 sq ft without a Colorado-registered structural engineer’s analysis.
- Fire. No wood shakes or shingles. Class A in mapped low, moderate and high fire intensity areas.
- Contractors must be registered under the county’s Contractor Registration Program.
Parker and Larkspur do it differently
| Town of Parker | Town of Larkspur | |
|---|---|---|
| Permit office | Parker Building Division | Town, with SAFEbuilt permits and inspections |
| Contractor | License with proof of competency on file | Check with the Town |
| Inspections | Final on all; mid-roof for tile, slate, stone-coated steel, flat roofs; 35 residential roof inspections a day | Scheduled with SAFEbuilt |
| Notes | No asphalt overlays; partial replacements must include the entire roof plane | Permits only inside town limits |
Our town pages go deeper: Parker, Highlands Ranch and Larkspur. Castle Rock is served from our Denver-area office: see roofers in Castle Rock and the Castle Rock roofing codes article.
A note on Woodmoor
Our Woodmoor page sits under this Douglas County section of the site, but Woodmoor is in northern El Paso County, so PPRBD permits it. See Woodmoor roofing and, just south of the county line, Palmer Lake. East of Douglas County, Elizabeth and Elbert are permitted by the Town of Elizabeth or Elbert County.
Get a Douglas County roof inspected
Integrity Roofing and Painting is veteran-owned, family-run since 1990, and an Owens Corning Platinum Preferred contractor with 650+ Google reviews. We reply the same business day. Call our Colorado Springs office at (719) 488-2800 or book a free roof inspection. After hail, see storm damage repair: the claim stays yours, and our photos make sure nothing gets missed in the scope.
Sources: Douglas County Building Division, Roofing; Douglas County, Building Permits; Town of Parker Building Division, Re-Roofing Requirements (revised 7/1/2026); Town of Larkspur, Building Department; Woodmoor Improvement Association.
