Fasting during Ramadan begins each day at the true dawn, the moment a horizontal line of white light spreads across the horizon before sunrise. The month itself starts on a different date each year because it follows the lunar Islamic calendar, shifting roughly 10 to 11 days earlier annually. For 2026, Ramadan is expected to begin on the evening of Tuesday, February 17, though the exact date depends on moon sighting in your region.
How the Month’s Start Date Is Determined
Ramadan is the ninth month of the Islamic lunar calendar, and its beginning is tied to the sighting of the new crescent moon. The traditional method, followed by the majority of Islamic scholars, requires an actual visual sighting of the crescent on the 29th evening of the preceding month, Sha’ban. If the crescent is spotted, fasting begins the next day. If clouds or haze block the view, the month of Sha’ban is completed at 30 days, and Ramadan starts the day after that.
This is why Ramadan can start on different days in different countries. Saudi Arabia, for example, may announce a start date one day earlier or later than communities in North America or Southeast Asia. Some organizations use astronomical calculations to predict the moon’s birth with high precision, but most traditional scholars maintain that physical sighting is the required standard, not just the calculated presence of a new moon below the horizon. The practical result: check with your local mosque or Islamic authority for the confirmed start date, because it can shift by a day even after predictions are published.
When Each Daily Fast Begins
Once Ramadan starts, you fast from true dawn to sunset every day. The critical moment each morning is the appearance of what Islamic scholarship calls the “true dawn” or “second dawn.” This is a band of white light that spreads horizontally along the entire horizon, growing steadily brighter until sunrise. It is distinct from the “false dawn,” a brief, vertical streak of light that appears earlier in the sky and then fades back to darkness.
The Quran describes this threshold poetically: eat and drink “until the white thread of dawn appears to you distinct from the black thread of night.” In practical terms, this corresponds to the Fajr prayer time listed on your local mosque’s schedule or a prayer-time app. From that moment, you abstain from food, drink, and intimate relations until the sun sets. Most prayer calendars calculate Fajr based on the sun being between 15 and 18 degrees below the horizon, depending on the convention your community follows. Even a few minutes’ difference between calculation methods can matter, so use the same source your local community relies on.
Timing in High-Latitude Regions
If you live far from the equator, dawn and dusk can stretch to extreme lengths. In northern Europe or Scandinavia during a summer Ramadan, the gap between true dawn and sunset can exceed 20 hours, while in winter it might be as short as 8. When Ramadan falls in months with very long days, some scholars permit following the timetable of the nearest city with a distinguishable dawn and dusk, or using the times of Mecca or Medina. Your local Islamic center will typically issue guidance specific to your latitude.
Who Is Exempt From Starting the Fast
A core principle of Ramadan fasting is that it should not cause serious harm. Several groups are exempt or advised not to fast:
- Children who have not reached puberty are not required to fast, though many families encourage shorter practice fasts.
- Pregnant and breastfeeding women are generally advised against fasting. A survey-based expert consensus recommends against fasting in the second and third trimesters in particular.
- Menstruating women do not fast during their period and make up missed days later.
- Travelers on long journeys have the option to postpone fasting and make up the days afterward.
- People with acute or chronic illness are exempt. Specific contraindications include poorly controlled hypertension, advanced kidney disease (stages IV and V), cirrhosis, severe heart failure, diabetes requiring close glucose management, active duodenal ulcers, and thyroid emergencies.
If you have a chronic condition, the decision to fast is best made with your doctor before Ramadan begins, not on the first morning. Many clinics in Muslim-majority countries and increasingly in Western cities hold pre-Ramadan consultations to adjust medication timing and assess risk.
Preparing Your Body Before Ramadan Starts
The transition from normal eating to a full day’s fast is easier if you prepare in the weeks beforehand. The biggest source of avoidable misery in early Ramadan is caffeine withdrawal. If you drink coffee or tea daily, the sudden absence during daylight hours can trigger headaches, fatigue, and irritability within 12 to 24 hours.
Johns Hopkins Aramco Healthcare recommends beginning a caffeine taper two to four weeks before Ramadan. In the third and fourth weeks before, start cutting your usual intake by about a quarter. In the second week, halve it. In the final week, switch to a single small cup or move to decaf entirely. Even starting just one week out makes a noticeable difference compared to quitting cold on day one. If you’re already inside the last week, reduce what you can and plan to have your remaining allowance during the pre-dawn meal.
What to Eat at the Pre-Dawn Meal
The pre-dawn meal, called suhoor, is your fuel for the entire fasting day. What you eat matters more than how much. Foods with a low glycemic index release energy slowly and delay hunger: whole grains, lentils, chickpeas, oats, and temperate fruits like apples and pears. Pairing these with high-fiber vegetables, seeds, or legumes extends satiety further. A bowl of oatmeal with nuts and a banana, or eggs with whole-grain bread and avocado, will carry you much longer than white rice or sugary cereal.
Hydration is equally important. Drink water steadily between iftar (the evening meal) and suhoor rather than trying to gulp large amounts right before dawn. Salty or heavily processed foods at suhoor increase thirst during the day, so keep the meal relatively plain and well-balanced.
Adjusting Your Sleep Schedule
Suhoor typically happens between 4:00 and 5:30 a.m., depending on your location and the time of year. If you normally wake at 7:00 a.m., that early alarm can create a significant sleep deficit within the first few days. Starting a week or two before Ramadan, try shifting your bedtime and wake time earlier by 15 to 20 minutes every few days. The goal is not to match the exact suhoor wake-up, but to close the gap enough that the first morning is not a shock.
Research on circadian rhythms during Ramadan suggests that fasting itself does not necessarily disrupt your internal clock, provided you keep meals limited to the predawn and evening windows and get adequate nighttime sleep. The disruption comes from late nights, whether from social gatherings, extended night prayers, or screen time, followed by the early suhoor alarm. Protecting a consistent block of sleep, even if it means skipping a late evening activity in the first week, pays off in energy, mood, and the ability to sustain the fast comfortably through the afternoon.