Khmer New Year (Chol Chnam Thmey): Mid-April (typically April 13-15). Cambodia's most important celebration marking the end of the harvest and new calendar year. Features water splashing celebrations, parades, temple visits, and family gatherings. The city becomes lively with festivities; book accommodations in advance.
Water Festival (Bon Om Touk): October-November (dates vary by lunar calendar). Celebrates the end of rice harvest and reversal of Tonlé Sap's water flow. Features boat racing, parades, and performances throughout the city. Massive crowds and festive atmosphere make it a must-see cultural event.
Royal Ploughing Ceremony: May (variable date). Ancient ritual marking the official start of rice planting season. Traditional costumes, sacred cattle, and Brahmin rituals provide fascinating cultural insight.
Buddhist Holidays: Visakha Bochea (Buddha's birthday) and Pchum Ben (ancestor honoring) see temple celebrations. Respectfully observe these important spiritual occasions.
Independence Day: November 9. National holiday with parades and cultural events celebrating Cambodian independence.