Best Time to Visit Mauna Kea for Stargazing: Season, Weather & Moon

Check your date: forecast, moon and sunset

How the season changes a summit night

A summit tour follows the same plan in every month. You are picked up in the afternoon in Kona, Waikoloa or Hilo, stop near the Visitor Information Station at 9,200 feet to get used to the altitude, ride a four-wheel-drive vehicle to the summit, almost 13,800 feet up, for sunset, then come down the mountain to look through a telescope. The summit itself closes to visitors 30 minutes after sunset, so the stargazing always happens lower down. The season changes how often storms close the road, how cold it is at the top and which part of the sky is up after dark.

April to November: the main season for a summit night

The Maunakea Weather Center, which posts the official road status, says there are very few road closures from April 1 through November 30. The summit is milder too: average highs at the observatories reach 42°F in April and 46 to 47°F from June to September, against 38°F from January to March. That is still cold, and nights drop close to freezing in every month, so you will want the parka that most summit tours lend.

Above the summit, the sky changes through these months. From June to September the bright center of the Milky Way stands high in the south as the stars come out, and the ʻImiloa Astronomy Center in Hilo calls mid-summer ideal for viewing it. By October it sits lower in the southwest after dark. In April and May it rises only late in the evening, near or after the end of most tours. Below you, the clouds usually stay on the lower slopes, held down by the layer of warmer air that sits well below the summit on most days, which is why the sunset so often happens over a sea of cloud.

Two costs come with these months. June to November is the Central Pacific hurricane season, and passing storms have closed the road: after Hurricane Hone in August 2024 it reopened on August 27, and mudslides from Hurricane Lala blocked it again in mid-August 2026. Sunset is also later in summer, after 7 p.m. in June and July, so tours return later at night than in winter.

December to March: snow, early sunsets and most of the closures

Winter is when snow falls on the summit, most often from January to March, and when the road closes most. Recent winters show what that means for a trip. About 8 to 10 inches of snow closed the road on January 5, 2026. At least 12 inches fell overnight on February 8, and the road and the Visitor Information Station both closed the next day, reopening on the afternoon of February 10. In mid-March, a Kona low, a winter storm that comes from the south and west rather than with the usual trade winds, brought nearly 2 feet of snow and gusts over 100 mph; the road was still closed for rebuilding on March 21.

On the days the road is open, winter has its own appeal. The summit can be white with snow, the sun sets earlier, in the early evening, and the winter sky, with Orion and the bright stars around it, is up in the evening. Average highs at the summit are about 38°F and nights fall below freezing, so wear every layer you brought. If you are visiting in winter, book your summit night early in your stay, so a closure leaves you other nights to try, if a later tour still has seats.

Other experiences you might enjoy

A Mauna Kea night pairs well with the rest of the Big Island: lava viewing in Hawaiʻi Volcanoes National Park, manta ray night snorkels off Kailua-Kona and the ʻImiloa Astronomy Center in Hilo.

Weather on the night and road closures

On any one night, the weather at the summit matters more than the month. The summit sky is fully clear about 56% of the time, and that share changes only a few percent through the year, according to a study of six years of sky measurements at the Canada-France-Hawaii Telescope. The observatory counts about 80% of nights as usable for astronomy. So a clear night is likely in any season, and no month guarantees one.

The road is a different matter, because it closes at the Visitor Information Station when conditions are unsafe. The Maunakea Rangers close it for any ice or snow on the road, for winds over 55 mph for more than an hour or gusts over 65 mph, or when visibility drops below 50 feet. The Weather Center says closures happen mostly in winter and are very few from April through November.

What happens to your tour varies by operator. One Hilo operator says its tour goes ahead whenever the summit road is open, whatever the weather; another says sunset and stargazing are not guaranteed in bad weather. If your booking has free cancellation, check the summit forecast and the road status before its deadline, and read your booking’s terms before relying on a weather refund. The weather in Hilo or Kona says little about the summit, which usually sits above the clouds.

The moon and the Milky Way

The moon makes more difference to the stargazing than the month does. A bright moon washes out faint stars and the glow of the Milky Way, while a dark night near the new moon shows many more stars. The moon only matters if it is up during the stargazing, an hour or two after sunset. In the days after the new moon and up to the full moon, a crescent or half moon is already in the evening sky; after the full moon it rises roughly 50 minutes later each night, so by about a week after it the early evening is dark. The Visitor Information Station’s own advice is to check the moon before you go up. The date checker above works it out for your night.

The Milky Way is up every night of the year, but its brightest part, toward the center of the galaxy, is in the evening sky only from about June to September, highest in July and August. In winter the evening sky belongs to Orion, Sirius and the winter constellations instead. Our month-by-month night sky guide has the meteor showers and constellations for each month, and our sunset guide covers the views at the top.

Mauna Kea month by month

The temperatures are long-run averages from the observatory weather tower on the summit ridge, and the stargazing stop lower down is a few degrees milder. Visitor numbers are everyone who flew to the Big Island that month, rounded, not people on the mountain, and they move from year to year.

How busy the Big Island and the summit get

The Big Island had its most visitors in December, July, January and March in 2025, and its fewest in November, September and May. In 2024 the pattern was much the same, with September the quietest month. These are arrivals to the whole island, not passengers on summit tours, so they say more about how far ahead to book than about how crowded the summit will be.

On the mountain, sunset is the busy time. In February 2025 the University of Hawaiʻi at Hilo warned that traffic on the access road, at the Visitor Information Station and at the summit had been significantly heavier than usual around sunset, especially on weekends and holidays, with even larger crowds after snowfall. Only seven companies are permitted to take visitors to the summit, and the university is not issuing more permits, so if your dates fall over the winter holidays or in July, book your tour early.

Which tour suits your dates

The Mauna Kea Summit Sunset & Stargazing Tour from Hawaii Island Holidays is the one we would book in any month: rated 4.8/5 from 759 reviews, from $289, with pickup in Kona or Waikoloa or a meeting point at the Visitor Information Station, and parkas, gloves, snacks, hot chocolate and night photos included. It takes ages 13 to 80, and you can cancel free up to 24 hours ahead; our guide to that tour covers how the evening runs and what its lower-rated reviews mention. The closest alternative is Hawaiian Eyes Tours’ Mauna Kea Summit Sunset & Star Tour with Photos, rated 4.8/5 from 328 reviews and from $290; it stargazes at about 12,000 feet and does not take guests under 16. Compare all the summit tour operators →

Staying in Hilo, the Hilo: Mauna Kea Summit Tour at Sunset from Arnott’s Lodge leaves from town (4.8/5 from 54 reviews, from $255) and goes ahead whenever the road is open. For a smaller evening with a private star show, Hawaii Forest & Trail’s Mauna Kea Summit, Dinner & Private Star Show is rated 4.8/5, though from only 19 reviews, and starts at $345.

If you are traveling with children under 13, the summit is off limits, so look at a tour that stays lower. The Mauna Kea Hike & Stargazing with a Native Hawaiian Guide walks to about 9,394 feet for sunset and the first stars (4.9/5 from 41 reviews, from $150, ages 9 and up, no transport). Our guide to stargazing beyond the summit covers the other all-ages options.

Frequently asked questions

Sources and methodology