Iowa has eight observatories where an ordinary person can walk up and look through a real telescope. Some are free every Saturday, one needs a reservation, and one is a rooftop that only opens about a dozen nights a year. Plus there’s a ninth that still shows up on other lists even though it was sold in 2020.
This guide sorts them by region, gives you the instruments and the booking method for each, and flags the ones where “open to the public” has fine print.
Table of Contents
- TLDR: Which Observatory Should You Visit?
- Quick-Reference Table
- Central Iowa
- Eastern Iowa
- Southeast Iowa
- Northern Iowa
- The Observatory That Closed: Fick
- Tips for Your First Visit
TLDR: Which Observatory Should You Visit?
- Most reliable weekly option: Ashton Observatory near Des Moines. Free Saturday nights, April through October.
- Biggest telescopes: Palisades-Dows near Cedar Rapids has a 24-inch Boller & Chivens and a 16-inch Celestron Cassegrain. Grinnell College’s Gale Observatory has a 24-inch Cassegrain, but opens only for occasional open houses.
- Oldest glass: The Witte Observatory in Sperry has a 12-inch Alvan Clark refractor from 1937. You have to reserve.
- Best for a city trip: Drake in Des Moines (Fridays) or the University of Iowa roof in Iowa City (about 12 nights a year).
- Best for a star party weekend: Menke Observatory near Dixon, home of the Eastern Iowa Star Party.
- Best for a weeknight in the north: McCollum Observatory at UNI in Cedar Falls, Thursdays during the school term.
Quick-Reference Table
| Observatory | Location | Main instruments | Cost | Season | How to get in |
|---|---|---|---|---|---|
| Ashton | Near Mingo (Jasper County), central | 16-inch Meade LX200 GPS, 16-inch f/5 Newtonian | Free on Saturdays | April to October | Walk-up Saturdays, 8 p.m. |
| Drake Municipal | Des Moines, central | Several telescopes | Free | Spring, summer, fall | Walk-up Fridays, no reservation |
| Gale (Grinnell College) | Grinnell, central-east | 24-inch Cassegrain | Free | Occasional | Periodic open houses, contact the college |
| Van Allen (University of Iowa) | Iowa City, east | Rooftop telescopes | Free | About 12 nights a year | Public Observing Nights |
| Palisades-Dows | Ely, east | 24-inch Boller & Chivens, 16-inch Celestron, 14-inch EdgeHD | Free | March to October | Monthly public nights |
| Menke | Near Dixon, east | Three telescopes | Free public events | Several events a year | Scheduled events, star party |
| Witte | Sperry, southeast | 12-inch refractor, 8-inch refractor, 16-inch Cassegrain | Not listed | Year-round by booking | Reservation only |
| McCollum (UNI) | Cedar Falls, north | Meade telescope | Free | School term | Thursday shows |
Hours and dates change. Every one of these is run by a club, a college or a county, and schedules move with the weather and the academic calendar. Check before you drive.
Central Iowa
1. Ashton Observatory
Ashton sits in Ashton Wildwood County Park, about 20 miles northeast of Des Moines near Mingo. It was built in 1983 through a partnership between Jasper County and the Des Moines Astronomical Society, and the society still runs it.
The instruments are a 16-inch Meade LX200 GPS Schmidt-Cassegrain and a 16-inch f/5 Newtonian. The Newtonian is the one to ask about for galaxies and star clusters; the Meade tracks planets and the Moon without anyone nudging it.
Public nights run Saturdays from April through October and cost nothing. Each one starts at 8 p.m. with a classroom program. The exception is the first Saturday of the month, which skips the talk and is pure stargazing. That makes the first Saturday the better pick if you’ve already heard the lecture, or if you have kids who’ll fidget through one.
Groups can book a private visit on any night except Saturday, for a small fee. The society’s site posts the current public schedule.
2. Drake Municipal Observatory
Drake sits on the grounds of the Waveland Park golf course in Des Moines, which makes it the easiest of the eight to fit into a city weekend. Drake University runs a Public Night Series on Friday nights in the spring, summer and fall.
The format is a talk of 45 minutes to an hour, then observing until everyone who wants a turn at the eyepiece has had one. No reservations, no admission fee. The Drake observatory events page lists the dates, and staff are only on site during those public nights, so a drive-by on another evening gets you nothing.
Be aware the address appears two ways across Drake’s own pages (4849 and 4898 Observatory Road). Use GPS pointed at the observatory name, or call the number on the events page that evening.
3. Grant O. Gale Observatory
Grinnell College opened the Gale Observatory in 1984. Its main instrument is a 24-inch Cassegrain reflector, which puts it level with the largest aperture on this list, with computer systems for telescope control and for data capture and analysis.
The catch is access. The college holds free open houses periodically instead of on a weekly schedule, so you can’t plan a trip around it until you’ve found a date. Contact the college’s physics and astronomy department for upcoming ones. If the timing works, this is the best chance in central Iowa to look through a 24-inch.
Eastern Iowa
4. Van Allen Observatory, University of Iowa
This one is on the roof of Van Allen Hall in Iowa City, named for James Van Allen, the University of Iowa physicist whose instruments on early satellites revealed the radiation belts around Earth. The observatory is run by the Department of Physics and Astronomy.
Public Observing Nights are free and open to everyone, and they happen about 12 times a year. Recent summer sessions have run on Friday evenings from 9 to 11 p.m. You reach the roof by following the signs in the building to the east elevator.
Twelve nights a year means the calendar matters more here than anywhere else. Check the university’s physics and astronomy event listings for the next date before planning a trip around it.
5. Palisades-Dows Observatory
If you only visit one observatory in Iowa and you care about aperture, make it this one. Palisades-Dows is in Ely, about 15 miles southeast of Cedar Rapids at 1365 Ivanhoe Road, on land belonging to Linn County Conservation. Cedar Amateur Astronomers broke ground on it in 1987 and run it today.
The roster is the deepest in the state: a 24-inch Boller & Chivens, a 16-inch Meade imaging telescope, a 16-inch Celestron classical Cassegrain from the 1970s, a computer-controlled 14-inch Celestron EdgeHD, and several portable scopes.
It opens for scheduled events only. The club hosts at least 12 public nights a year plus a Solar Saturday, typically one night a month from March through October. Each one is a short program followed by telescope viewing and observatory tours. Start times usually fall between 7:30 and 8:30 p.m. Dates are listed on the club’s NASA Night Sky Network page. Admission is free.
6. Menke Observatory
Menke is at the Wapsi River Environmental Education Center near Dixon, in Scott County. St. Ambrose University owns it, and it holds three telescopes and a classroom. It moved to its current site in 1994.
Its main draw is the calendar rather than a single night. St. Ambrose and the Wapsi River Center host several public stargazing events each year, and the Eastern Iowa Star Party takes place here, run with the Quad Cities Astronomical Society and the Popular Astronomy Club. It stretches over multiple nights with daytime talks and night-time observing, and registration has been required in past years. Public events are free.
That makes Menke the answer to the “Iowa star parties” question. For event dates and how to sign up, start with the Wapsi River Center’s Menke page.
Southeast Iowa
7. John H. Witte Observatory Complex
Witte is three observatories in one spot, at the Big Hollow Recreation Area in Sperry, about 12 miles north of Burlington. The Southeastern Iowa Astronomy Club works with Des Moines County Conservation, the Burlington Community School District and the John H. Witte Jr. Foundation to run it.
- Witte Observatory Building: a 12-inch Alvan Clark refractor made in 1937, believed to be the largest refractor in Iowa. The building itself was completed in 1987.
- Prugh-Carver Observatory: a roll-off-roof building with John Witte’s own 8-inch refractor.
- Stone-Kelly Observatory: a 16-inch Ealing Cassegrain that came from Burlington High School in 2004 and sits here on long-term loan.
Refractors with Clark optics are rare in the Midwest, and a 1937 one is the kind of instrument you can’t see through almost anywhere else in the state. That is the reason to book this.
Access is by reservation only, through the Southeastern Iowa Astronomy Club’s Calendly page. Sessions are 90 minutes and capped at 20 visitors. Groups should call Des Moines County Conservation at 319-753-8260. The county’s Witte Observatory page doesn’t list a fee, so confirm the cost when you book.
Northern Iowa
8. McCollum Observatory, University of Northern Iowa
McCollum is the observatory on top of McCollum Science Hall in Cedar Falls, and it runs the simplest schedule on the list. The dome opens for Thursday shows during the school term, usually at 9 p.m. and moving earlier after the first Sunday in November. The shows run until the week before Thanksgiving, pause for winter, and resume after spring break. Expect nothing during final exam weeks or summer.
A show lasts from about 30 minutes to just over an hour, and admission is free. The telescope is a Meade. You’re not here for aperture; you’re here because it’s a free weeknight in the only northern-Iowa observatory that keeps a regular calendar.
The Observatory That Closed: Fick
Many lists still include the Erwin W. Fick Observatory southwest of Boone. Cross it off.
Iowa State University built Fick in 1970. Its instruments included a 0.6-meter Mather reflector and an 8.5-meter radio dish, and researchers used it for stellar radial velocity work, ring galaxy collision studies and lunar occultation timing. It was the last astronomical research observatory run by a college or university at a dark-sky site in Iowa. It closed in 2015, and on April 1, 2020 the observatory and its 45 acres were sold to a private buyer. You can’t visit, and the grounds aren’t open to the public.
Tips for Your First Visit
- Call or check the schedule first. Almost every site on this list opens on a club or college calendar. Weather cancellations are common, and some sites post a go or no-go decision the same afternoon.
- Bring a red flashlight. White light ruins night vision for 20 to 30 minutes. Red light doesn’t. Cover a phone flashlight with red cellophane if you don’t have one.
- Dress warmer than the forecast says. Iowa nights drop fast, even in summer, and you’ll be standing still. In spring and fall, bring a coat and a hat. Observatory domes aren’t heated.
- Check the Moon phase. A full Moon is great for lunar craters and terrible for galaxies. Near the new Moon, the faint stuff shows up. First-time visitors often have more fun on a half-lit Moon, when the craters along the terminator throw long shadows.
- Expect to wait. One telescope, many eyes. Public nights are talks plus a line at the eyepiece, not a private session.
- Ask questions at the eyepiece. The volunteers who run these sites are club members who have been doing this for decades. They know what’s worth looking at that night.
- Stay for the sky, not just the scope. Ashton, Palisades-Dows, Witte and Menke all sit out of town. Give your eyes time to adjust and look up while you wait your turn.
