An RV in Wisconsin is winterized for about 4 months a year at Green Bay, and the median first 32°F night arrives October 9 at Green Bay (NOAA 1991-2020). 63 RV & motorhome storage facilities are listed in Wisconsin, 35 with indoor or climate-controlled space.
| Month | Milwaukee high / low | RV | Green Bay snow | Green Bay high / low | RV |
|---|---|---|---|---|---|
| Jan | 31° / 17° | winterized | 14.3 in | 26° / 11° | winterized |
| Feb | 34° / 20° | winterized | 12.0 in | 29° / 13° | winterized |
| Mar | 44° / 29° | shoulder trips | 8.1 in | 40° / 24° | winterized |
| Apr | 55° / 38° | shoulder trips | 4.7 in | 54° / 35° | shoulder trips |
| May | 67° / 48° | camping | 0.0 in | 67° / 46° | camping |
| Jun | 77° / 58° | camping | 0.0 in | 77° / 56° | camping |
| Jul | 82° / 65° | camping | 0.0 in | 81° / 60° | camping |
| Aug | 80° / 64° | camping | 0.0 in | 79° / 58° | camping |
| Sep | 74° / 56° | camping | 0.0 in | 72° / 50° | camping |
| Oct | 61° / 45° | camping | 0.3 in | 58° / 40° | shoulder trips |
| Nov | 48° / 33° | shoulder trips | 3.1 in | 44° / 29° | shoulder trips |
| Dec | 36° / 23° | winterized | 13.1 in | 31° / 18° | winterized |
RV column rule: camping at a 40°F low or warmer with highs under 95°F; shoulder trips above a 28°F low; winterized below.
By that rule an RV at Milwaukee has 6 months camping (May to October), 3 of shoulder trips and 3 winterized. By that rule an RV at Green Bay has 5 months camping (May to September), 3 of shoulder trips and 4 winterized.
Wisconsin is hard-freeze country: Green Bay logs about 152.3 nights at or below 32°F and 66.3 days that never thaw, enough to freeze any water left in the water lines, pump, water heater and toilet valve.
63 live listings in 43 cities; by listed type: 35 indoor, 5 covered and 58 outdoor (types overlap). No Wisconsin RV & motorhome storage listing publishes a rate on StowHelp.
| Facility | City | Listed storage | Listed amenities | Also listed for |
|---|---|---|---|---|
| Lone Silo Premium RV Storage | Waukesha | indoor, outdoor, covered | Trailer | |
| Brookfield Self Storage | Brookfield | indoor, outdoor, covered | Trailer | |
| Brothers Self Storage | Oconomowoc | indoor, outdoor | ||
| Bulldog Mini Storage | Pardeeville | indoor, outdoor | ||
| Stor-It Right Hartland | Hartland | indoor, outdoor | ||
| Waukesha Storage | Milwaukee | indoor, outdoor | ||
| Barth Storage - Kenosha | Kenosha | indoor, outdoor, covered | security cameras, gated entry | Trailer |
| Interstate Storage | Poynette | indoor, outdoor | ||
| Supreme Marine & RV | Pewaukee | indoor, outdoor, covered | Trailer | |
| Summit Self Storage LLC | Janesville | indoor, outdoor | ||
| Jv Storage | Sturtevant | indoor, outdoor | ||
| AA Advantage Self Storage | Ixonia | indoor, outdoor | ||
| Mad City Marine/Rv Sales & Storage | Arlington | indoor, outdoor | ||
| Super Storage | Oconomowoc | indoor, outdoor | ||
| Blackhawk Mini Storage | Madison | indoor, outdoor | ||
| Jerry's Camping Center | Madison | indoor, outdoor | ||
| Extra Space Storage - Brookfield | Brookfield | indoor, outdoor, covered | Trailer | |
| Bob Kimball Properties | Janesville | indoor, outdoor | ||
| Stor-A-Lot LLC | Milton | indoor, outdoor | ||
| : First Choice Storage | Sun Prairie | indoor, outdoor |
| City | RV & Motorhome Storage listings | Indoor | Climate-controlled | Outdoor |
|---|---|---|---|---|
| Madison | 6 | 4 | 0 | 6 |
| Milwaukee | 6 | 1 | 0 | 1 |
| Janesville | 5 | 5 | 0 | 5 |
| Oconomowoc | 3 | 3 | 0 | 3 |
| Brodhead | 2 | 0 | 0 | 2 |
| Brookfield | 2 | 2 | 0 | 2 |
| Dodgeville | 2 | 1 | 0 | 2 |
| Lannon | 2 | 2 | 0 | 2 |
| Arlington | 1 | 1 | 0 | 1 |
| Baraboo | 1 | 0 | 0 | 1 |
NOAA's 1991-2020 median first 32°F night is October 29 at Milwaukee and October 9 at Green Bay; winterize by September 25, two weeks ahead of the earlier date. By our RV rule Milwaukee stays camping through October and Green Bay through September, then 3 months of shoulder trips follow at Milwaukee. 35 Wisconsin listings offer indoor or climate-controlled space.
3 at Milwaukee (November to April) and 4 at Green Bay (October to April), plus 3 and 3 months of shoulder trips. Those winterized months hold 47.5 of the 55.6 inches of snow Green Bay averages a year (85%), which is the load on a cover or carport roof. At Milwaukee an RV is camping from May to October (6 months), against 5 at Green Bay.
Of 63 live Wisconsin listings, 35 list indoor space and 0 climate-controlled units, against 58 outdoor and 5 covered. By city: Madison (6 listed, 4 indoor), Milwaukee (6 listed, 1 indoor), Janesville (5 listed, 5 indoor) and Oconomowoc (3 listed, 3 indoor). Most indoor listings: Janesville (5), Madison (4) and Oconomowoc (3). Ask whether indoor means heated; listings span 43 cities in all.
At Green Bay, 5 months average a low at or below 32°F: 4 winterized and 1 shoulder trips or camping by our RV rule. Green Bay logs 152.3 nights at or below 32°F and 19.2 at or below 0°F a year; January, the coldest month, averages 11.1°F and is winterized for an RV. Drain or re-protect the RV after any outing in those 1 month.
After the last frost. The median last 32°F night is April 19 at Milwaukee and April 30 at Green Bay; the last 28°F hard freeze comes around April 6 and April 17. Our rule makes May the first month camping at Milwaukee and May at Green Bay. That month Milwaukee averages a 47.8°F low and a 66.5°F high. Reverse each winterization step first.
Wisconsin RV & motorhome storage listings span 43 cities, led by Madison (6 listed), Milwaukee (6 listed), Janesville (5 listed), Oconomowoc (3 listed) and Brodhead (2 listed). For outdoor winter parking, Madison (6 outdoor) and Janesville (5 outdoor) lead. Statewide, 58 list outdoor, 5 covered and 35 indoor or climate-controlled spaces. Compare the cities nearest you before October 9.
NOAA NCEI Climate Normals 1991-2020 (USW00014839, USW00014898); NOAA AOML hurricane impacts 1851-2025; StowHelp listings 2026-10-07 (methodology).