Mount Isto — a mountain peak in North Slope Borough, Alaska at about 2,702 m (8,865 ft) above sea level — is a rewarding subject for landscape photographers. It is part of Arctic National Wildlife Refuge.
Mount Isto is the highest peak in the Brooks Range, Alaska, USA. Located in the eastern Brooks Range, in what are known as the Romanzof Mountains, Mount Isto is 5 miles (8.0 km) south of Mount Hubley, the second tallest peak in the Brooks Range. Mount Isto is within the Arctic National Wildlife Refuge and was named in 1966 for Reynold E. (Pete) Isto, a civil engineer for the U.S. Geological Survey. In 2014, new measurement technology established that Mount Isto is the highest peak in the Brooks Range. Previously, Mount Chamberlin was believed to be the tallest, but it is now ranked third.From the Wikipedia article “Mount Isto”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At this latitude the sun does not rise or set on some days of the year, so check the monthly table below for daylight and twilight.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:35 AM | 88° E | 7:52 PM | 272° W | 21° | 12h 17m |
| June solstice (Jun 21) | — | — | — | — | 44° | — |
| September equinox (Sep 22) | 7:17 AM | 87° E | 7:40 PM | 273° W | 21° | 12h 23m |
| December solstice (Dec 21) | — | — | — | — | -3° | — |
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
Summits catch first and last light — alpenglow can turn rock pink or orange minutes before sunrise and after sunset while valleys stay in shadow.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 9:43 AM | 11:50 AM | — | — | 1:41 PM | 3:48 PM | 1h 51m |
| February | 7:57 AM | 9:03 AM | 11:02 AM | 2:39 PM | 4:38 PM | 5:44 PM | 7h 35m |
| March | 6:59 AM | 7:57 AM | 9:16 AM | 6:14 PM | 7:33 PM | 8:31 PM | 11h 36m |
| April | 4:19 AM | 5:36 AM | 6:59 AM | 8:12 PM | 9:35 PM | 10:52 PM | 15h 59m |
| May | — | 2:48 AM | 5:07 AM | 9:57 PM | 12:17 AM | — | 21h 28m |
| June | — | — | 3:59 AM | 11:15 PM | — | — | — |
| July | — | — | 4:38 AM | 10:46 PM | — | — | — |
| August | 2:47 AM | 4:44 AM | 6:18 AM | 9:03 PM | 10:37 PM | 12:34 AM | 17h 54m |
| September | 5:49 AM | 6:51 AM | 8:08 AM | 6:55 PM | 8:12 PM | 9:13 PM | 13h 21m |
| October | 7:45 AM | 8:45 AM | 10:18 AM | 4:25 PM | 5:58 PM | 6:59 PM | 9h 13m |
| November | 8:40 AM | 10:09 AM | — | — | 2:32 PM | 4:01 PM | 4h 23m |
| December | 10:08 AM | — | — | — | — | 2:54 PM | — |
Local time (America/Anchorage), 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
The Milky Way's bright core (in Sagittarius) barely clears the southern horizon at this latitude, so focus on winter Milky Way, aurora or star trails instead.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -16° | — |
| February | Below 10° in darkness | — | -14° | — |
| March | Below 10° in darkness | — | -16° | — |
| April | No darkness | — | — | — |
| May | No darkness | — | — | — |
| June | No darkness | — | — | — |
| July | No darkness | — | — | — |
| August | No darkness | — | — | — |
| September | Below 10° in darkness | — | -13° | — |
| October | Below 10° in darkness | — | -16° | — |
| November | Below 10° in darkness | — | -16° | — |
| December | Below 10° in darkness | — | -22° | — |
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: 1 Bortle 1 — Excellent dark-sky site. The Milky Way casts faint shadows; zodiacal light and airglow are obvious. Modeled zenith brightness ≈ 21.95 mag/arcsec². Aurora needs roughly Kp 0.0+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show January as the clearest month (about 49% average cloud cover) and August as the cloudiest (78%). 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 | 35 | 33 | 34 | 47 | 67 | 75 | 73 | 71 | 59 | 43 | 39 | 35 |
| Low °F | -45 | -40 | -43 | -36 | -14 | 18 | 23 | 18 | 0 | -15 | -33 | -42 |
| Precip. (in) | 0.5 | 0.5 | 0.4 | 0.6 | 1.1 | 2.2 | 2.9 | 2.9 | 1.9 | 1.3 | 0.7 | 0.5 |
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 mountain peak
- Photograph the peak from a lake, meadow or ridge at sunrise when the face that looks east lights up first.
- Long lenses compress ridgelines; shoot the peak from several miles away to make it look massive.
- Afternoon thunderstorms are common in summer at high elevations — plan summit hikes for early morning.
- Snow on the summit holds detail best when you expose for the highlights and lift shadows later.
- Scout in daylight if you plan to shoot at night or before sunrise.
Season: Early summer keeps snow on the peaks with green valleys below; autumn adds aspen or larch color in many ranges.
Suggested gear: Telephoto lens, Lightweight tripod, Warm layers, Microspikes in shoulder seasons. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Permits, drones & access
Drones: Launching or landing drones on National Wildlife Refuge lands generally requires a special use permit from the refuge manager, and wildlife disturbance rules apply everywhere.
FAQ
When is the best time to photograph Mount Isto?
What time is golden hour at Mount Isto?
Where does the sun rise and set at Mount Isto?
Can you see the Milky Way from Mount Isto?
Do you need a permit to photograph at Mount Isto?
Sources
Location data: Wikidata, USGS GNIS / GeoNames, 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.