How accurate are the sunrise times?

Our calculations use standard astronomical algorithms accounting for atmospheric refraction and are accurate within ±1-2 minutes for most US locations.

Does the alarm work if I close my browser?

No. The alarm runs in your browser tab, so the tab must remain open for the alarm to sound. We recommend keeping the tab open overnight.

Why do sunrise times change throughout the year?

Earth's axial tilt causes the sun's path across the sky to shift seasonally. In summer, the sun rises earlier and sets later (longer days). In winter, the opposite occurs. This effect is more dramatic at higher latitudes.

Golden hour is the period shortly after sunrise or before sunset when the sun is low and produces warm, golden-toned light. It typically lasts 20-30 minutes and is prized by photographers.

Sunrise Alarm Clock USA - Wake Up with the Sun

What Is a Sunrise Alarm Clock?

A sunrise alarm clock wakes you up naturally by syncing your alarm with the actual sunrise time at your location. Instead of jolting awake at a fixed hour, you align your sleep cycle with natural daylight, which research suggests improves mood, energy, and circadian rhythm.

Why Wake Up at Sunrise?

Better sleep quality — aligning with natural light helps regulate melatonin production.
More morning energy — sunlight triggers cortisol release, your body's natural wake-up hormone.
Improved mood — early daylight exposure is linked to lower rates of seasonal depression.
Seasonal adaptation — your wake time adjusts naturally as days grow longer or shorter.

How This Tool Works

We calculate sunrise and sunset times using astronomical algorithms based on your selected city's latitude, longitude, and time zone. The calculation accounts for atmospheric refraction and the sun's angular diameter, providing accuracy within ±1 minute for most US locations.

You can offset your alarm before or after sunrise to suit your morning routine. The alarm sound plays directly in your browser — no app install required.

US Time Zones and Sunrise

The United States spans six primary time zones: Eastern (ET), Central (CT), Mountain (MT), Pacific (PT), Alaska (AKT), and Hawaii-Aleutian (HAT). Sunrise times vary dramatically — on a March morning, New York might see sunrise at 6:15 AM while Honolulu won't see it until 6:40 AM local time, despite being much further south.

Wake Up with the Sun

Select Your City

Set Sunrise Alarm

Today's Sunrise Across the US

Sunrise Alarm FAQ

What Is a Sunrise Alarm Clock?

Why Wake Up at Sunrise?

How This Tool Works

US Time Zones and Sunrise