Event Place Date Time Admission(s)
Monthly Free Star Party Centennial Observatory Saturday, April 11, 2026 8:45-10:45 p.m. Free
International Astronomy Day Solar Viewing Centennial Observatory Saturday, April 25, 2026 11:00 a.m.-4:00 p.m. Free
International Astronomy Day Star Party Centennial Observatory Saturday, April 25, 2026 9:00-11:00 p.m. Free
Monthly Free Star Party Centennial Observatory Saturday, May 9, 2026 9:30-11:30 p.m. Free
Summer Solar Session #1 Centennial Observatory Wednesday, May 27, 2026 1:30-3:30 p.m. Free
Summer Solar Session #2 Centennial Observatory Wednesday, June 3, 2026 1:30-3:30 p.m. Free
Best evening apparition of Mercury in 2026 & Venus-Jupiter conjunction Centennial Observatory Tuesday, June 9, 2026 9:15-9:30 p.m. Free
Summer Solar Session #3 Centennial Observatory Wednesday, June 10, 2026 1:30-3:30 p.m. Free
Monthly Free Star Party Centennial Observatory Saturday, June 13, 2026 9:45-11:45 p.m. Free
Summer Solar Session #4 & close Moon-Venus conjunction Centennial Observatory Wednesday, June 17, 2026 1:30-3:30 p.m. Free
Summer Solar Session #5 Centennial Observatory Wednesday, June 24, 2026 1:30-3:30 p.m. Free
International Asteroid Day Festival Centennial Observatory Saturday, June 27, 2026 1:00-5:00 p.m. Free
Summer Solar Session #6 Centennial Observatory Wednesday, July 1, 2026 1:30-3:30 p.m. Free
Close Conjunction of Mars and Uranus Centennial Observatory Saturday, July 4, 2026 5:00-5:30 a.m. Free
Summer Solar Session #7 Centennial Observatory Wednesday, July 8, 2026 1:30-3:30 p.m. Free
Monthly Free Star Party Centennial Observatory Saturday, July 11, 2026 9:45-11:45 p.m. Free
Summer Solar Session #8 Centennial Observatory Wednesday, July 15, 2026 1:30-3:30 p.m. Free
Annual Castle Rocks Star Party solar viewing Castle Rocks Visitor Center, Almo, Idaho Friday, July 17 & Saturday, July 18, 2026 12:00-5:00 p.m. Free
Annual Castle Rocks Star Party telescope viewing The Lodge, Castle Rocks State Park Friday, July 17 & Saturday, July 18, 2026 Starting at 9:30 p.m. Free (park use fees apply)
Summer Solar Session #9 Centennial Observatory Wednesday, July 22, 2026 1:30-3:30 p.m. Free
Peak Pluto in 2026 Centennial Observatory Friday, July 24, 2026 1:45-2:15 a.m. Free
Summer Solar Session #10 Centennial Observatory Wednesday, July 29, 2026 1:30-3:30 p.m. Free
Summer Solar Session #11 Centennial Observatory Wednesday, August 5, 2026 1:30-3:30 p.m. Free
Monthly Free Star Party Centennial Observatory Saturday, August 8, 2026 9:45-11:45 p.m. Free
Summer Solar Session #12 Centennial Observatory Wednesday, August 12, 2026 1:30-3:30 p.m. Free
Summer Solar Session #13 Centennial Observatory Wednesday, August 19, 2026 1:30-3:30 p.m. Free
Summer Solar Session #14 Centennial Observatory Wednesday, August 26, 2026 1:30-3:30 p.m. Free
Deep partial lunar eclipse Centennial Observatory Tuesday, August 28, 2026 8:00 p.m.-12:00 a.m. Free
Monthly Free Star Party Centennial Observatory Saturday, September 12, 2026 8:45-10:45 p.m. Free
International Observe the Moon Night Centennial Observatory Saturday, September 19, 2026 8:30-9:30 p.m. Free
Closest approach of Saturn in 2026 Centennial Observatory Sunday, October 4, 2026 1:15-1:45 a.m. Free
Monthly Free Star Party Centennial Observatory Saturday, October 10, 2026 8:00-10:00 p.m. Free
Telescope Tuesday Centennial Observatory Tuesday, November 10, 2026 6:15-9:00 p.m. $1.50, ages 6 & under free, or free with planetarium admission
Monthly Free Star Party Centennial Observatory Saturday, November 14, 2026 6:15-9:00 p.m. Free
Best morning apparition of Mercury in 2026 Centennial Observatory Thursday, November 19, 2026 7:15-7:30 a.m. Free
Telescope Tuesday Centennial Observatory Tuesday, November 24, 2026 6:15-9:00 p.m. $1.50, ages 6 & under free, or free with planetarium admission
Telescope Tuesday Centennial Observatory Tuesday, December 8, 2026 6:00-9:00 p.m. $1.50, ages 6 & under free, or free with planetarium admission
Monthly Free Star Party Centennial Observatory Saturday, December 12, 2026 6:00-9:00 p.m. Free
Telescope Tuesday Centennial Observatory Tuesday, December 22, 2026 6:00-9:00 p.m. $1.50, ages 6 & under free, or free with planetarium admission