Sun Valley's Darkest Nights This Winter Run on the Moon's Schedule

This summer Sun Valley Resort became the first resort in the United States certified through DarkSky International's lodging and resorts program. The best stargazing this winter still depends on the moon. This winter the darkest skies come in short windows around the new moons of December 8, January 7 and February 6. The December and January windows also hold the two best-placed meteor showers of the season, and all six of the area's scheduled astronomy dinners land within two days of one of those new moons. A resident who puts those weeks on the calendar now will see more stars than one who heads out whenever the sky looks clear.

What the July Certification Covers

DarkSky International announced the designation on July 13, 2026. Its program calls it a DarkSky Approved Resort, and the resort's own announcement calls it a DarkSky Certified Resort. In DarkSky's words, the resort "demonstrated compliance with DarkSky standards related to responsible outdoor lighting, habitat protection, and public education."

The program's published guidelines spell out what that compliance involves. A resort needs at least 67 percent of its existing lighting to conform when it applies, 80 percent within two years of certification and 100 percent within five years. Lights should be shielded and pointed down, with glare kept low and dimmers, timers or occupancy sensors where they make sense. Certified resorts also file a habitat report on light-sensitive nocturnal species, measure sky quality every year, submit an annual report each March 1 and recertify every five years. Neither the resort nor DarkSky has published a list of the specific fixtures or buildings that changed. The certification sets a standard the resort has to keep meeting over the next several years. It does not describe one finished renovation.

The new designation also sits on top of older protections. The Central Idaho Dark Sky Reserve was certified in December 2017. It covers 906,000 acres across parts of Blaine, Boise, Custer and Elmore counties, including Ketchum and Sun Valley, and the Idaho Dark Sky Alliance runs its day-to-day operations. Ketchum became Idaho's first International Dark Sky Community in 2017. The Alliance dates local lighting ordinances to 1999 in Ketchum, 2002 in Hailey and 2004 in Sun Valley. Outdoor lighting in the valley has been shielded for decades, so on any given night the moon makes a much bigger difference than any recent fixture change.

The Calendar That Decides the Season

Meteor shower peaks and moon phases are fixed well in advance. Timeanddate's moon table for Sun Valley and the American Meteor Society's 2026 calendar together lay out the whole season.

The meteor society expects this month's Orionids to be washed out by a bright moon, which takes the first shower of the season off the list. The Leonids get a half-lit moon, and the sources disagree by a night. The meteor society lists the peak as November 16–17, while the resort's 2026–27 Dark Sky Calendar lists November 17–18 and puts the shower at up to 15 meteors an hour. In November, the November 9 new moon is a better reason to step outside than either peak.

The table changes in December. Both the Geminids and the Quadrantids peak under a thin crescent, a few days from a new moon, and the meteor society rates the lunar conditions as generally favorable for each.

December 7 to 14: The Week Everything Lines Up

The resort's calendar calls the Geminids "the year's favorite shower," with up to 120 multicolored meteors an hour at the peak. This year the peak falls on December 13–14, five nights after the December 8 new moon, so the sky stays mostly dark around it.

The Sawtooth Botanical Garden put its first two Dark Sky Dinners of the season on either side of that new moon, Monday, December 7 and Wednesday, December 9. Each runs from 5:30 to 8 p.m. for 40 guests. The evening starts with appetizers by the fire and a drink from the garden's Snow Bar, and dinner is served at 6 p.m. in the heated greenhouse. After a short talk from celestial educators, guests go outside to look through a telescope with a local astronomer. Tickets are $150 per person, all inclusive. The garden runs the dinners with the Idaho Dark Sky Alliance, the Environmental Resource Center and the Idaho Community Foundation, holds them in any weather and notes that they sell out.

Between those dinners and the Geminid peak, the Village has its busiest evening of early winter. The Tree Lighting Ceremony on December 12 begins at 5:30 p.m., and the tree is lit at 6. The next two nights are the shower's peak.

The Holiday Weeks Trade Darkness for Ambiance

The resort's Trail Creek sleigh dinners run December 18 through January 1. Sleighs leave the Sun Valley Inn every hour on the hour from 4 to 8 p.m. and travel to Trail Creek Cabin, two miles north of the Village, for a four-course prix fixe dinner. Each departure holds up to 48 people. Prices start at $315 per adult and $189 per child aged 3 to 12, with gratuity included and the bar tab extra, and reservations open October 13.

Those two weeks hold the longest night of the year. The solstice falls on December 21 at 1:50 p.m. MST, so even the 4 p.m. sleigh heads out in fading light. The same weeks also include the December 23 full moon, and the Ursids peak on December 21–22 at five to ten meteors an hour. On a clear night, the moon will be lighting the snow on the way up to Trail Creek Cabin, with fewer stars overhead. The resort lists the Trail Creek Cabin area as a viewing spot for its open meadow and minimal surrounding light. The darkest nights for that spot fall on either side of the holidays.

January 3 to 8: The Second Window

The Quadrantids peak on January 3–4 under a 16 percent waning crescent. The meteor society predicts the peak near 03:30 UT on January 4, which is the evening of January 3 in Sun Valley. The resort's calendar also points to Venus at its greatest elongation on January 3, bright in the southeastern sky before sunrise all month. The new moon follows on January 7.

The botanical garden's next two Dark Sky Dinners fall in that same stretch, on Wednesday, January 6 and Friday, January 8, 2027. A final pair follows on February 5 and 8. The resort's calendar puts the February new moon on February 6 and describes it as an especially dark night for deep-sky viewing. All six dinners fall within two days of a new moon.

Farther north, Galena Lodge hosts monthly full-moon dinners in winter. The evening is a four-course meal, with the option to ski or snowshoe the trails before or after, and reservations are required. The lodge's site says it is closed for fall and reopens December 4. It has not yet posted this season's dinner dates. Given the moon table, a full-moon dinner would fall near November 24, December 23 or January 22, and those nights suit moonlit trails better than faint stars.

Where the Resort Says to Look

The resort's announcement lists these viewing spots:

• Bald Mountain Summit at the Roundhouse, for views above the valley's glow
• Trail Creek Cabin area, open meadow with little light nearby
• Dollar Mountain Lodge, wide-open skies suited to naked-eye viewing
• Sun Valley Pavilion Lawn, the Whitecloud Trail System and the Hemingway Memorial area, within the Village's lighting standards
• Galena Summit on Highway 75, about 30 miles north and one of the darkest spots in the Central Idaho Dark Sky Reserve

The list doesn't say which spots are open or reachable after dark in winter, and the resort hasn't announced winter evening service at the Roundhouse. The Village spots and Dollar Mountain Lodge are the easiest to reach on a December night. Galena Summit is a mountain pass drive in winter, so check road conditions on Idaho 511 before going. The resort's stargazing page suggests bringing a red light, wearing layers, checking the moon phase and giving your eyes about 30 minutes to adjust to the dark.

The resort has said guided stargazing and astronomy events "may" follow from the certification. Its only dated event so far was Stars Over Sun Valley on August 12, a $125 Perseid night at the Roundhouse. The Idaho Dark Sky Alliance's program page currently lists nothing after September. For now, the Sawtooth Botanical Garden dinners are the only scheduled astronomy evenings this winter, and the moon table covers the rest.

If you're planning a Geminid night or a Trail Creek sleigh dinner with guests this December, Erika Rixon is happy to share what she knows about Sun Valley's winter evenings, from the Village spots to the drive up Highway 75. Let's Connect.