A personal watercraft in Wisconsin is off the water for about 7 months a year at Milwaukee, and the median first 32°F night arrives October 9 at Green Bay (NOAA 1991-2020). 24 jet ski & PWC storage facilities are listed in Wisconsin, 21 with indoor or climate-controlled space.
| Month | Milwaukee high / low | personal watercraft | Green Bay snow | Green Bay high / low | personal watercraft |
|---|---|---|---|---|---|
| Jan | 31° / 17° | off the water | 14.3 in | 26° / 11° | off the water |
| Feb | 34° / 20° | off the water | 12.0 in | 29° / 13° | off the water |
| Mar | 44° / 29° | off the water | 8.1 in | 40° / 24° | off the water |
| Apr | 55° / 38° | off the water | 4.7 in | 54° / 35° | off the water |
| May | 67° / 48° | wetsuit weather | 0.0 in | 67° / 46° | wetsuit weather |
| Jun | 77° / 58° | on the water | 0.0 in | 77° / 56° | on the water |
| Jul | 82° / 65° | on the water | 0.0 in | 81° / 60° | on the water |
| Aug | 80° / 64° | on the water | 0.0 in | 79° / 58° | on the water |
| Sep | 74° / 56° | wetsuit weather | 0.0 in | 72° / 50° | wetsuit weather |
| Oct | 61° / 45° | off the water | 0.3 in | 58° / 40° | off the water |
| Nov | 48° / 33° | off the water | 3.1 in | 44° / 29° | off the water |
| Dec | 36° / 23° | off the water | 13.1 in | 31° / 18° | off the water |
Jet Ski column rule: on the water from a 76°F high; wetsuit weather from 66°F; off the water below.
By that rule a personal watercraft at Milwaukee has 3 months on the water (June to August), 2 of wetsuit weather and 7 off the water. By that rule a personal watercraft at Green Bay has 3 months on the water (June to August), 2 of wetsuit weather and 7 off the water.
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 exhaust, cooling passages and pump housing.
24 live listings in 9 cities; by listed type: 21 indoor, 17 covered and 21 outdoor (types overlap). No Wisconsin jet ski & PWC storage listing publishes a rate on StowHelp.
| Facility | City | Listed storage | Listed amenities | Also listed for |
|---|---|---|---|---|
| Maritime Storage Facility | Port Washington | indoor, outdoor, covered | Boat | |
| SkipperBud's Milwaukee Drystack | Milwaukee | indoor, outdoor, covered | Boat | |
| Pharo Marine | Waunakee | indoor, outdoor, covered | Boat | |
| Lake Geneva Boat Storage | Lake Geneva | indoor, outdoor, covered | Boat | |
| Streblow Custom Boats | Lake Geneva | indoor, outdoor, covered | Boat | |
| Staudacher Rose Marian | Milwaukee | indoor, outdoor | Boat | |
| Beach House Marina | Madison | indoor, outdoor | Boat | |
| The Boat House - Door County | Sister Bay | indoor, outdoor, covered | Boat | |
| Affordable Self Storage - Madison | Madison | indoor, outdoor, covered | security cameras, gated entry | Boat |
| CenterPointe Marine | Pewaukee | indoor, outdoor, covered | Boat |
| City | Jet Ski & PWC Storage listings | Indoor | Climate-controlled | Outdoor |
|---|---|---|---|---|
| Milwaukee | 9 | 6 | 0 | 6 |
| Lake Geneva | 7 | 7 | 0 | 7 |
| Madison | 2 | 2 | 0 | 2 |
| Lodi | 1 | 1 | 0 | 1 |
| Pewaukee | 1 | 1 | 0 | 1 |
| Port Washington | 1 | 1 | 0 | 1 |
| Sister Bay | 1 | 1 | 0 | 1 |
| Stoughton | 1 | 1 | 0 | 1 |
| Waunakee | 1 | 1 | 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 personal watercraft rule Milwaukee stays on the water through August and Green Bay through August, then 2 months of wetsuit weather follow at Milwaukee. 21 Wisconsin listings offer indoor or climate-controlled space.
7 at Milwaukee (September to May) and 7 at Green Bay (September to May), plus 2 and 2 months of wetsuit weather. Those off the water months hold 55.6 of the 55.6 inches of snow Green Bay averages a year (100%), which is the load on a cover or carport roof. At Milwaukee a personal watercraft is on the water from June to August (3 months), against 3 at Green Bay.
Of 24 live Wisconsin listings, 21 list indoor space and 0 climate-controlled units, against 21 outdoor and 17 covered. By city: Milwaukee (9 listed, 6 indoor), Lake Geneva (7 listed, 7 indoor), Madison (2 listed, 2 indoor) and Lodi (1 listed, 1 indoor). Most indoor listings: Lake Geneva (7), Milwaukee (6) and Madison (2). Ask whether indoor means heated; listings span 9 cities in all.
At Green Bay, 5 months average a low at or below 32°F, all of them off the water months by our personal watercraft 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 off the water for a personal watercraft.
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 June the first month on the water at Milwaukee and June at Green Bay. That month Milwaukee averages a 58.4°F low and a 76.8°F high. Reverse each winterization step first.
Wisconsin jet ski & PWC storage listings span 9 cities, led by Milwaukee (9 listed), Lake Geneva (7 listed), Madison (2 listed), Lodi (1 listed) and Pewaukee (1 listed). For outdoor winter parking, Lake Geneva (7 outdoor) and Milwaukee (6 outdoor) lead. Statewide, 21 list outdoor, 17 covered and 21 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).