Prayer times across the United States

WhiskAI uses the Islamic Society of North America (ISNA) standard for all 30 US cities — Fajr and Isha both calculated at 15° below the horizon, Asr by the standard Shafi'i shadow rule. ISNA is the convention used by ISNA itself, the Islamic Circle of North America (ICNA), the Fiqh Council of North America, and the majority of American mosques including the Islamic Center of America in Dearborn (the largest mosque in North America by capacity), the Mosque Foundation in Chicago, and the Islamic Center of Greater Houston network. Hanafi-school readers can switch the Asr calculation per city via the toggle. WhiskAI does not currently support city-by-city method overrides; we publish a single national standard for consistency.

ISNA uses tighter twilight angles (15° / 15°) than the Muslim World League (18° / 17°), producing slightly later Fajr times and slightly earlier Isha times — typically a 15 to 25 minute difference at temperate latitudes. The Egyptian General Authority of Survey method (19.5° / 17.5°) is used by some US mosques with North African heritage and produces noticeably earlier Fajr and later Isha than ISNA. The Umm al-Qura method (used in Saudi Arabia: Fajr 18.5°, Isha 90 minutes after Maghrib) appears in a small number of US mosques. The University of Islamic Sciences (Karachi) method (18° / 18°) is occasionally seen in Pakistani-tradition mosques. WhiskAI defaults to ISNA across all US cities because it is the most widely adopted American convention.

The United States spans four time zones and 25 degrees of latitude — from Seattle and Boston near 47°N down to Miami at 25°N — and the variation is reflected in calculated prayer times. In late June, summer Fajr in Seattle arrives around 03:30 with Isha after 23:00, producing an 18-hour daylight window. In Miami, the same date sees Fajr at 05:15 and Isha at 21:00 — a far more moderate 14-hour window. Time zone offsets compound this effect: Maghrib in New York can be 19:30 while Maghrib in Los Angeles the same day is 19:55, three hours later in absolute clock time. WhiskAI calculates each US city independently from its own latitude, longitude, and time zone to reflect these geographic realities accurately.

WhiskAI lists 1 to 3 notable mosques per US city — typically the largest, oldest, or most central — drawn from public sources and verified against each mosque's own website. For a comprehensive directory of all US mosques, the ISNA mosque finder at isna.net/mosques and the ICNA centre directory are the two most authoritative national listings. The Salaam directory and the Salatomatic listing also maintain cross-referenced records of American mosques. Detroit and Dearborn (Michigan), the Bridgeview area of Chicago, the Devon Avenue corridor in Chicago's North Side, the Plainfield headquarters area in Indianapolis, and the Northern Virginia / Falls Church corridor are the largest concentrated Muslim community hubs in the country and merit specific mention beyond the city listings.