Rock County, Wisconsin: roof stress score 48.4 of 100

Rock County ranks #588 of 1,113 scored counties (moderate stress) and #4 of 52 in Wisconsin. Rock County homes: 85.2% predate 2000, median year 1970. Hail in Rock County (1 inch or more): 1.8 days a year. Permits in Rock County ran 45.9 per 1,000 homes, 2014 to 2025.

Rock County very high (top 10%)high (next 20%)moderate (middle 40%)lower (bottom 30%)

Inputs behind the 48.4

InputRock CountyMedianStress percentileIn WI
Homes built before 2000 85.2%80.4% 67 95
Severe hail days per year 1.82.0 37 82
New-home permits per 1,000 homes (inverted) 45.935.5 42 78

Average of 67, 37 and 42: 48.4

Rock County on age: only 14.8% of homes date from 2000 or later. Rock County on hail: 21 severe days over 12 full years, 3 at the 2014 peak. Rock County on building: 45.9 permits per 1,000 homes; median 35.5.

Rock County: is your roof past its time?




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Rock County hail days: NOAA 1 inch+ reports

Rock County homes by decade built

70,694 housing units by decade built 19.1% pre-1940 7.3% 1940s 10.9% 1950s 13.3% 1960s 15.3% 1970s 7.8% 1980s 11.6% 1990s 10.2% 2000s 3.9% 2010s 0.7% 2020+
70,694 housing units by decade built
pre-194019.1%
1940s7.3%
1950s10.9%
1960s13.3%
1970s15.3%
1980s7.8%
1990s11.6%
2000s10.2%
2010s3.9%
2020+0.7%

70,694 housing units. Biggest slice: pre-1940, 19.1%. Before 1980: 65.8%. Since 2010: 4.6%.

New-home permits in Rock County

3,247 single-family permits by year 123 14 184 15 229 16 242 17 310 18 321 19 351 20 361 21 286 22 223 23 301 24 316 25
3,247 single-family permits by year
14123
15184
16229
17242
18310
19321
20351
21361
22286
23223
24301
25316

Rock County issued 3,247 single-family permits, equal to 4.6% of its 70,694 housing units. Pace: about 280 a year lately, up from 179 a year at the start. Peak: 361 permits in 2021.

Severe hail days in Rock County, by year

Rock County severe days per year 3 14 1 15 2 16 2 17 1 18 2 19 1 20 2 21 2 22 1 23 2 24 2 25 4 26*
Rock County severe days per year
143
151
162
172
181
192
201
212
222
231
242
252
26*4

* partial year. Rock County: severe days in 12 of 12 full years (worst: 2014, 3 days). Ten biggest storms: Rock County hail history.

Map of 60 hail reports in Rock County

1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1.25 in hail1.25 in hail1.25 in hail1.25 in hail1.25 in hail1.25 in hail1.5 in hail1.5 in hail1.5 in hail1.5 in hail1.5 in hail1.5 in hail1.5 in hail1.75 in hail1.75 in hail1.75 in hail1.75 in hail1.75 in hail1.75 in hail1.75 in hail1.75 in hail2 in hail2 in hail2 in hail2 in hail2 in hail2.5 in hail2.75 in hail2.75 in hail2.75 in hail Janesville
1 to 1.74 in1.75 to 2.74 in2.75 in and up

Dots mark reports, not storm paths.

Rock County among Wisconsin counties

CountyScorePre-2000Hail daysPermitsGap
Racine County49.487.1%1.427.0+1.0
Rock County48.485.2%1.845.9-0.0
La Crosse County37.278.5%1.645.8-11.2

3 published. Rock County on the Wisconsin map

Counties scoring near 48.4

CountyRankScoreGap
Saginaw County, MI#57449.2+0.8
Buchanan County, MO#57549.2+0.8
Douglas County, NE#58148.7+0.3
Summit County, OH#59248.0-0.4
Oklahoma County, OK#59347.9-0.5
Scott County, IA#60147.3-1.1

Why Rock County lands at 48.4

Rock County: housing age pulls hardest, at the 67th percentile. Age stands at 67, hail at 37, renewal at 42. Your house may differ: the score of Rock County is not a verdict on one roof.

Rock County next steps

  1. Check an address in Rock County: hail check.
  2. Compare Rock County with roof age by city.
  3. Claim clock after a Rock County storm: deadlines and date calculator.
  4. Rock County roofers we list: Janesville.

Rock County data: NOAA (21 severe days), Census ACS (70,694 homes), Census BPS (3,247 permits). Method, limits and common questions