First Day of Autumn in Boulder
United States — September 1, 2026
until
---
Days
--
Hours
--
Minutes
--
Seconds
until First Day of Autumn on September 1, 2026
65% elapsed
129 days remaining
Boulder
19:35:05
America/Denver
GMT / UTC
01:35:05
Etc/UTC
Mecca
04:35:05
UTC+3
About First Day of Autumn
Meteorological start of autumn on September 1, marking the transition from summer to cooler months.
Boulder Quick Facts
- Country
- 🇺🇸 United States
- Timezone
- America/Denver
- Population
- 106,803
- Coordinates
- 40.015, -105.2706
Sun Times Today in Boulder
Sunrise
06:09
Solar Noon
12:59
Sunset
19:48
Golden Hour
19:11
Daylight
13h 39m
Local time
Prayer Times Today in Boulder
| Prayer | Time (Local) |
|---|---|
| Fajr | 04:28 |
| Sunrise | 06:09 |
| Dhuhr | 12:59 |
| Asr | 16:46 |
| Maghrib | 19:48 |
| Isha | 21:23 |
Based on MWL calculation method. Local time.
Weather
Nearby Cities
Upcoming Events in Boulder
Map
Map loading...
Frequently Asked Questions
- When is First Day of Autumn in Boulder?
- First Day of Autumn in Boulder falls on Tuesday, September 1, 2026.
- What timezone is Boulder in?
- Boulder is in the America/Denver timezone.