Located in Mahaska County, Iowa, Lake Keomah State Park is a state park. The nearest town is Oskaloosa, about 8.7 km (5.4 mi) away (Lake Keomah State Park lies E of town).
Lake Keomah State Park is a state park in Mahaska County, Iowa, United States. To the park's immediate east is Keomah Village and the park is approximately 4 miles (6.4 km) east of Oskaloosa. Lake Keomah State Park is a 366-acre (148 ha) state park that surrounds and includes Lake Keomah. Lake Keomah is an 83-acre (34 ha) reservoir.From the Wikipedia article “Lake Keomah State Park”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Lake Keomah State Park the sunrise point swings a long way through the year: about 57° (ENE) at the June solstice and 121° (ESE) in late December. Sunset moves from 303° (WNW) in June to 239° (WSW) in December, and the midday sun climbs to 72° in summer but only 25° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:14 AM | 90° E | 7:22 PM | 271° W | 49° | 12h 08m |
| June solstice (Jun 21) | 5:38 AM | 57° ENE | 8:47 PM | 303° WNW | 72° | 15h 10m |
| September equinox (Sep 22) | 6:58 AM | 89° E | 7:09 PM | 271° W | 49° | 12h 11m |
| December solstice (Dec 21) | 7:33 AM | 121° ESE | 4:45 PM | 239° WSW | 25° | 9h 11m |
Azimuth is measured clockwise from true north (90° = east, 270° = west). Computed for 2026; values change by less than a degree from year to year.
Golden hour & blue hour by month
State parks often protect a signature feature — a gorge, lake or overlook — that is best in early morning before visitors and harsh light arrive.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 7:04 AM | 7:34 AM | 8:17 AM | 4:23 PM | 5:06 PM | 5:36 PM | 9h 32m |
| February | 6:38 AM | 7:06 AM | 7:45 AM | 5:06 PM | 5:44 PM | 6:13 PM | 10h 38m |
| March | 6:55 AM | 7:23 AM | 7:59 AM | 6:40 PM | 7:17 PM | 7:45 PM | 11h 54m |
| April | 6:03 AM | 6:31 AM | 7:08 AM | 7:13 PM | 7:50 PM | 8:19 PM | 13h 19m |
| May | 5:21 AM | 5:53 AM | 6:32 AM | 7:43 PM | 8:22 PM | 8:54 PM | 14h 30m |
| June | 5:03 AM | 5:37 AM | 6:19 AM | 8:04 PM | 8:46 PM | 9:19 PM | 15h 08m |
| July | 5:18 AM | 5:51 AM | 6:31 AM | 8:02 PM | 8:43 PM | 9:16 PM | 14h 52m |
| August | 5:51 AM | 6:20 AM | 6:58 AM | 7:33 PM | 8:11 PM | 8:41 PM | 13h 51m |
| September | 6:24 AM | 6:51 AM | 7:28 AM | 6:45 PM | 7:21 PM | 7:49 PM | 12h 30m |
| October | 6:55 AM | 7:22 AM | 8:00 AM | 5:53 PM | 6:31 PM | 6:59 PM | 11h 08m |
| November | 6:30 AM | 6:59 AM | 7:40 AM | 4:11 PM | 4:52 PM | 5:22 PM | 9h 53m |
| December | 6:58 AM | 7:30 AM | 8:14 AM | 3:58 PM | 4:43 PM | 5:14 PM | 9h 13m |
Local time (America/Chicago), including daylight saving time. Golden hour runs from about −4° to +6° solar altitude, so the morning golden hour begins during blue hour, before sunrise.
Milky Way & night sky
From Lake Keomah State Park, the Milky Way core is visible in a dark sky from March through September. June gives the longest window (about 4.5 hours on a moonless night), and the core peaks around 20° above the southern horizon. Our light-pollution model puts the sky at about Bortle 3 (rural sky), good enough for detailed Milky Way images.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -2° | — |
| February | 5:27 AM – 5:27 AM | 0.0 | 10° | SE → SE |
| March | 4:39 AM – 5:39 AM | 1.0 | 16° | SE → SSE |
| April | 2:39 AM – 4:49 AM | 2.2 | 19° | SE → S |
| May | 12:36 AM – 3:56 AM | 3.3 | 20° | SE → S |
| June | 10:54 PM – 3:24 AM | 4.5 | 20° | SSE → SSW |
| July | 10:44 PM – 2:04 AM | 3.3 | 20° | S → SW |
| August | 9:55 PM – 11:55 PM | 2.0 | 19° | S → SW |
| September | 8:55 PM – 9:55 PM | 1.0 | 16° | SSW → SW |
| October | 8:02 PM – 8:02 PM | 0.0 | 10° | SW → SW |
| November | Below 10° in darkness | — | -1° | — |
| December | Below 10° in darkness | — | -19° | — |
Window when the galactic core is at least 10° high during astronomical darkness on the 15th of each month. Pick nights within a few days of the new moon. Plan exact nights with the Milky Way planner.
Estimated sky darkness: 3 Bortle 3 — Rural sky. Some light domes sit on the horizon, but the Milky Way still looks complex overhead. Modeled zenith brightness ≈ 21.36 mag/arcsec². Aurora needs roughly Kp 6.5+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show September as the clearest month (about 43% average cloud cover) and December as the cloudiest (66%). July is the warmest month and January the coldest, which matters for gear, snow access and how long batteries last at night.
Average cloud cover (%)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 56 | 72 | 78 | 85 | 96 | 103 | 110 | 105 | 102 | 91 | 76 | 71 |
| Low °F | -33 | -14 | -10 | 17 | 28 | 44 | 47 | 44 | 35 | 22 | 7 | -17 |
| Precip. (in) | 1.0 | 1.4 | 2.0 | 3.6 | 4.4 | 5.4 | 3.6 | 4.3 | 3.5 | 2.9 | 1.9 | 1.7 |
Monthly climatology for the surrounding 1° grid cell from NASA POWER (MERRA-2). Mountain sites can be colder and cloudier than the cell average.
Photography tips for this state park
- Check park hours: many state parks close at dusk, which affects sunset and night shooting.
- Ask rangers about photography permits for commercial work, models or drones.
- Weekday mornings are the least crowded at popular viewpoints.
- Trail maps often mark overlooks — combine them with the sun azimuth to plan.
- Scout in daylight if you plan to shoot at night or before sunrise.
Season: Spring wildflowers and autumn color are peak seasons in most parks.
Suggested gear: Versatile zoom lens, Tripod, Park pass. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Permits, drones & access
Drones: Drone rules in state parks vary by state and even by park — many require a permit or ban recreational drone flights. Check the park's rules and the FAA B4UFLY app before flying.
Nearby photo spots
Other locations within 40 km of Lake Keomah State Park, closest first.
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When is the best time to photograph Lake Keomah State Park?
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Can you see the Milky Way from Lake Keomah State Park?
Do you need a permit to photograph at Lake Keomah State Park?
How far is Lake Keomah State Park from Oskaloosa?
Sources
Location data: Wikidata, Wikipedia. Sun, moon and Milky Way times are computed by LWPhoto Atlas for 2026. Climate: NASA POWER. Sky darkness is a population-based estimate (Walker's law), not a measurement. See data sources & licenses.