Iowa Waterparks 2026 Tickets, Hours & Best Trip Options
Comparing waterparks in Iowa is harder than it looks because the state mixes large outdoor destination parks, amusement-park waterparks, inexpensive municipal facilities and indoor hotel resorts. This guide separates them so you can compare 2026 ticket prices, seasonal hours, indoor vs. outdoor access, family suitability, locations and current operating status before making the drive.
Iowa Waterpark Snapshot
Choose by trip style — not just by which park appears first in search results.
Which Iowa Waterpark Fits Your Trip?
Pick your season, group and main priority. This gives you a more useful starting point than treating every Iowa waterpark as the same type of attraction.
Iowa Waterparks 2026: Tickets, Hours & Type Comparison
Ticket numbers are not directly comparable. Adventure Bay is tied to amusement-park admission, Lost Island is a dedicated waterpark, Siouxnami is a municipal facility, and several other choices are hotel/resort waterparks.
| Waterpark | City | Type | 2026 Price Signal | 2026 Hours / Season | Good Fit For |
|---|---|---|---|---|---|
| Lost Island Waterpark | Waterloo | Outdoor destination park | $32–$36 + tax online signal | Typical in-season 10:30 AM–6:30 PM; 2026 summer season ended | Major slides, wave pool, lazy river, full-day trip |
| Adventure Bay | Altoona | Waterpark inside Adventureland | Included with eligible Adventureland admission | Opened May 23; hours varied by date through summer season | Families wanting coasters + waterpark together |
| King’s Pointe | Storm Lake | Indoor + outdoor resort park | $17 adult / $13 child / $3 age 3 & under | Outdoor May 31–Labor Day; indoor schedule varies | Affordable resort waterpark trip |
| Boji Splash | Arnolds Park | Indoor resort + outdoor pool | $28 summer general / $16 off-season general | Summer daily; off-season primarily Fri–Sun | Okoboji trips, resort families, cooler weather |
| Siouxnami | Sioux Center | Municipal indoor + outdoor aquatic complex | $10 adult / $8 youth-senior / $4 pre-K | Summer schedule varies by weekday | Value, kids, local families |
| Grand Harbor | Dubuque | 25,000 sq. ft. indoor resort park | Verify current public wristband rate | Year-round park; daily schedule can vary | Indoor Dubuque getaway |
| Huck’s Harbor | Burlington | Outdoor resort waterpark | $12 / $5 after 5 PM | Late-season schedule is weather dependent | Budget outdoor swimming |
| Siouxland Splash | Sioux City | New outdoor waterpark project | Website lists $29.95 / $24.95 | Opening status requires confirmation | Future Sioux City trip after confirmed opening |
Best Iowa Waterpark Choice by Trip Type
Big Outdoor Day
Lost Island offers the clearest dedicated destination-waterpark experience among Iowa’s larger summer choices.
Rides + Slides
Adventure Bay works differently because eligible Adventureland admission includes the waterpark when Adventure Bay is operating.
Resort Weekend
King’s Pointe and Boji Splash combine water activities with a hotel/resort stay rather than functioning only as stand-alone parks.
Lower-Cost Visit
Siouxnami and Huck’s Harbor can cost much less than the large destination parks for straightforward family swimming.
Lost Island Waterpark — Waterloo
2225 E. Shaulis Road, Waterloo, Iowa 50701
Lost Island is the Iowa choice to examine first when your goal is a traditional full-day outdoor waterpark rather than a hotel pool complex. The Waterloo park combines major slides, a water coaster, wave pool, lazy river, raft attractions, toddler areas, cabanas and on-site food.
Thrill riders, mixed-age families and visitors who want enough water attractions to fill most of a summer day.
Lost Island Waterpark and Lost Island Themepark are separate gates with separate maps, parking plans and ticket products.
Adventure Bay at Adventureland — Altoona
3200 Adventureland Drive, Altoona, Iowa 50009
Adventure Bay is unusual because it is part of Adventureland. The official Adventureland FAQ says regular park admission includes Adventure Bay during the waterpark’s operating months, subject to capacity.
Attractions include a large wave pool, lazy river, major slides, family water play and children’s areas. This setup works especially well when one family wants both roller coasters and water attractions without buying separate park admission products.
King’s Pointe Waterpark Resort — Storm Lake
1520 E. Lakeshore Drive, Storm Lake, Iowa 50588
King’s Pointe combines a lakefront resort with indoor and outdoor waterparks. The outdoor park is roughly 50,000 square feet and includes slides, a lazy river, aquatic play, diving and pool areas.
The indoor facility includes a zero-depth-entry pool, slides and play features. The resort warns that its indoor and outdoor waterparks are seasonal and that parts of the indoor facility can close during fall/winter periods, so the live calendar matters even when booking a hotel room.
Parking and waterpark tubes are listed as complimentary.
Non-hotel visitors should plan to bring their own towels.
Boji Splash Indoor Waterpark — Arnolds Park / Okoboji
630 Linden Drive, Arnolds Park, Iowa 51331
Boji Splash at Bridges Bay Resort is a strong Okoboji-area choice when your plans need an indoor water option. Features include an all-ages tube slide, lazy river, 500-gallon dump bucket, children’s play, aquatic basketball and a large indoor whirlpool.
2026 Summer Hours
| Day | Published Summer Hours | Planning Note |
|---|---|---|
| Monday–Saturday | 10 AM–8 PM | Summer season May 23–Sept. 7, 2026. |
| Sunday | 10 AM–5 PM | Sunday Funday admission was listed at $18. |
| Labor Day Monday | 10 AM–5 PM | Final summer-season holiday schedule. |
Siouxnami Waterpark — Sioux Center
770 7th Street NE, Sioux Center, Iowa 51250
Siouxnami at the city-operated All Seasons Center is one of the more practical value-oriented choices in northwest Iowa. It includes indoor and outdoor slides, an outdoor aqua zip line, a lazy river with waves, a 16-foot climbing wall, zero-depth entry pools and splash areas.
2026 Summer Schedule Published by Sioux Center
| Day | 2026 Hours | Special Note |
|---|---|---|
| Monday, Tuesday, Thursday, Friday | 12 PM–8 PM | Weekdays 12–1 PM were membership-holder time. |
| Wednesday & Saturday | 12 PM–6 PM | Shorter public schedule. |
| Sunday | 1 PM–5 PM | Reduced Sunday hours. |
Grand Harbor Resort & Waterpark — Dubuque
350 Bell Street, Dubuque, Iowa 52001
Grand Harbor is a Dubuque indoor-resort option rather than a giant outdoor slide park. The official resort describes a 25,000-square-foot indoor waterpark built for teenagers, children, toddlers and adults.
The current public waterpark page does not clearly publish a complete general day-pass price and daily-hours table. Instead of copying a stale third-party price, call or check with Grand Harbor for the exact date you intend to visit.
Huck’s Harbor at FunCity — Burlington
3001 Winegard Drive, Burlington, Iowa 52601
Huck’s Harbor is a lower-cost outdoor option with waterslides, a lazy river, activity pool and splash pad. It is attached to the larger FunCity Resort entertainment complex in Burlington.
Blue and green slides list a 42-inch requirement; tube and speed slides list 48 inches.
Lockers are listed at $10, with $5 returned when the key is returned.
Siouxland Splash — Sioux City: Verify Opening Status
3820 US-75, Sioux City, Iowa 51108
Siouxland Splash deserves a special warning because its website currently publishes planned operating hours, admission rates and attraction pages, yet late-August 2026 reporting said construction finishing work and state inspections remained before opening to the public.
Indoor Waterparks in Iowa: Which Work Beyond Summer?
Indoor does not automatically mean “open every day of the year.” King’s Pointe explicitly uses seasonal operating calendars, Boji Splash changes from a summer schedule to an off-season weekend schedule, and Grand Harbor’s daily waterpark availability should be confirmed before travel.
Grand Harbor
Dubuque resort with a 25,000-square-foot indoor park and year-round positioning.
Boji Splash
Indoor Okoboji-area waterpark with resort rooms and weekend off-season operation.
King’s Pointe
Storm Lake indoor/outdoor option where the exact calendar should be checked before reserving a stay.
If weather-proof swimming is your main goal rather than specifically staying in Iowa, our 2026 U.S. indoor waterpark planning guide explains day passes, hotel-access rules, winter trips, towels, lockers and resort-vs-day-pass decisions.
Iowa Waterparks Map
Iowa’s major waterparks are spread widely across the state. Do not assume two parks that both appear in an “Iowa waterparks” search are convenient to combine on the same day.
Adventure Bay in Altoona near Des Moines.
Lost Island in Waterloo and Grand Harbor in Dubuque.
King’s Pointe, Boji Splash and Siouxnami.
Which Iowa Waterpark Works for Your Family?
| Your Group | Good Starting Options | Why | Check Before Driving |
|---|---|---|---|
| Toddlers / preschool | Siouxnami, Boji Splash, King’s Pointe | Zero-depth or smaller-child play plus lower-intensity areas. | Swim diapers, child admission age and open-play schedule. |
| 48″+ thrill riders | Lost Island, Adventure Bay | Larger slide collections and stronger full-day thrill potential. | Individual slide height/weight rules. |
| Mixed-age family | Lost Island, Adventure Bay, King’s Pointe | Combination of slides, calmer water and kid areas. | Meeting point, height split and meal timing. |
| Winter / rain trip | Boji Splash, Grand Harbor, King’s Pointe | Indoor water access. | Indoor calendar and public/day-pass access. |
| Budget-focused | Siouxnami, Huck’s Harbor | Lower listed base admission than destination parks. | Travel cost can erase ticket savings. |
Compare the Real Cost — Not Just the Ticket
A $12 park can cost more overall than a $30 park if you drive several extra hours, need a hotel or pay for multiple add-ons. Build your budget from the full trip.
Admission
Check child-age rules, date-based pricing, online discounts and whether the waterpark is bundled with another park.
Parking + Gas
Lost Island lists paid parking, while some resort/municipal parks include parking.
Locker / Cabana
Shade, storage and premium seating can add substantially to destination-waterpark spending.
Food
Check outside-food restrictions before packing a cooler that cannot enter.
When Is Iowa Waterpark Season?
Large outdoor Iowa parks are primarily summer attractions. Memorial Day through Labor Day is the key planning window, although individual parks may open later, close earlier or use weekend-only shoulder-season dates.
Opening Period
Adventure Bay opened May 23 in 2026, while Siouxnami’s published opening date was May 28.
Main Summer Window
This is when outdoor parks typically offer their most useful operating calendars.
Indoor / Reduced Schedules
Shift attention toward indoor resorts and verify late-season outdoor weekend schedules carefully.
How to Plan an Iowa Waterpark Day Without Wasting the First Hour
Iowa Waterpark Packing Checklist
Bring for Most Parks
- Tickets or booking confirmation.
- Swimsuits that meet slide rules.
- Towels when the park does not supply them.
- Sunscreen for outdoor parks.
- Dry clothes.
- Water-friendly footwear.
- Waterproof phone protection.
- Swim diapers where needed.
- Payment card or approved payment method.
Verify Before Packing
- Outside food and cooler policy.
- Life-jacket rules.
- Personal flotation-device restrictions.
- Locker availability.
- Towel availability.
- Re-entry policy.
- Glass-container restrictions.
- Ride-specific swimwear rules.
Waterparks Near Iowa for a Longer Midwest Trip
Iowa families in the north sometimes have an equally practical drive to Minnesota indoor resorts. Our Minnesota indoor waterpark 2026 comparison covers Bloomington, the Twin Cities, Duluth and Brainerd/Baxter options for colder-weather trips.
If your priority is a much larger outdoor destination and you are comfortable driving farther northeast, compare Iowa’s options with our Noah’s Ark Wisconsin Dells tickets and hours guide before deciding whether the extra travel distance makes sense.
Iowa Waterparks FAQ 2026
What is a good Iowa waterpark for a full outdoor waterpark day?
Lost Island Waterpark in Waterloo is one of the strongest fits for a dedicated full outdoor waterpark day because it combines major slides, a wave pool, lazy river, children’s areas and cabanas in one park.
Which Iowa waterpark is included with an amusement park ticket?
Adventure Bay is inside Adventureland in Altoona. Adventureland’s official FAQ says admission includes Adventure Bay during the waterpark’s operating months, subject to capacity and the current ticket terms.
How much are Lost Island Waterpark tickets in 2026?
Current 2026 information reviewed for this guide shows online waterpark tickets for guests age 4+ generally in the $32–$36 plus-tax range when purchased under the applicable advance-purchase terms. Children age 3 and under are listed free.
How much is King’s Pointe Waterpark?
King’s Pointe currently lists adults age 12+ at $17 plus tax, children age 4–11 at $13 plus tax, children age 3 and under at $3, and non-swimmers at $8 plus tax.
How much is Boji Splash Waterpark in 2026?
Bridges Bay lists summer general admission at $28 for age 4 through adult, summer senior admission at $18 and children age 3 and under free. Its off-season general admission is listed at $16.
How much is Siouxnami Waterpark?
Sioux Center’s current summer public-swim rates list adults at $10, youth and senior citizens at $8, pre-K children at $4 and children age 2 and under free.
Which Iowa waterparks are indoors?
Major indoor choices include Grand Harbor Resort in Dubuque, Boji Splash at Bridges Bay Resort, King’s Pointe’s indoor facility in Storm Lake and the indoor portions of the All Seasons Center / Siouxnami complex in Sioux Center. Operating calendars differ.
Is Huck’s Harbor expensive?
Huck’s Harbor’s official page currently lists general admission at $12 per person, $5 after 5 PM and free admission for children age 2 and under. Late-season operation is weather dependent.
Is Siouxland Splash in Sioux City open?
Do not assume it is open based only on the ticket and planned-hours pages. As of the latest 2026 information reviewed for this guide, late-August reporting said finishing work and state inspections still remained. Confirm a dated official public-opening announcement before buying or driving.
What Iowa waterpark should I consider in fall or winter?
Focus on indoor facilities such as Boji Splash, Grand Harbor or King’s Pointe, but still check the exact operating calendar. “Indoor” does not guarantee that every attraction operates every day of the year.
Official Sources Checked
Prices, hours and status information in this guide were prioritized from park/operator websites and Iowa municipal sources. Where an operator did not publish a clear current general-admission rate, this guide says to verify rather than substituting an unverified number.
Independent guide: USWaterParkGuide.org does not operate any Iowa waterpark, sell tickets or process reservations. Prices, taxes, operating calendars, child-age rules, ride availability, parking, food policies, public day-pass access, hotel wristband rules and weather closures can change. Confirm the final details with the park/operator before paying or traveling.