The calendar of Once is divided into twelve named months, each of thirty days. Days within each month are named for elements cycling through a ten-day week: Sun, Moon, Stars, Earth, Fire, Water, Air, Wood, Metal, Paper. Three independent calendar systems (G, M, C) track different lunar cycles. Major festivals are noted below.
| Month | Season / Character | Notable Festivals & Events |
| Reap | Harvest — warm, golden, smelling of ripe grain and bonfires | Reaping Festival (Day 7 — Air): Kicks off the last days of harvest. Threshing Day (Day 14 — Earth): All hands in the fields, including nobility. Harvest Festival (Day 16 — Water): Feast day, great celebration. |
| Leaf | Mid-autumn — crisp air, falling leaves, the world quieting | No major festivals. A month of travel, preparation, and reflection. Adventurers often set out in Leaf. |
| Wither | Early winter — bare trees, cold rain, the world going grey | Festival of Dormius (Days 1–10): Honours Dorminus, the god of gifts and generosity. The Grand Gift of Dormius—a massive ornate present—is displayed in town squares. Winter Nights Festival (Day 20 — Paper): Honours Aphrodite through feasts and gift-giving. |
| Chill | Deep winter — frost, stillness, long nights | Cold month. Hearth season. Some say spirits walk more freely in Chill. |
| Snow | Late winter — heavy snowfall, the year at its darkest | Festival of Inari begins on Day 30 (Paper): A week-long celebration of the fox deity Inari. Celebrated most fully in Rekai; outsiders are welcome during this time. |
| Wind | Late winter into early spring — thaw begins, fierce storms | Festival of Inari continues (Days 1–10). Xander’s birthdate falls on Day 9 (Metal). The world begins to wake. |
| Sprout | Early spring — first buds, new lambs, mud everywhere | Kuso’s birthdate falls on Day 30 (Paper). A month of beginnings. Planting season. |
| Bloom | Full spring — flowers, warmth, bees, travelling weather | Solar Festival of Kinich Ahau (around Day 10 — Paper): Celebration of the Sun God, particularly in the southern realms (Valle De Cocora, Micchu, Santa Cecelia) and among Carra’s people. |
| Tend | Early summer — warm, long days, the crops growing tall | Aphrodisia (Day 1): Devotees of Aphrodite celebrate with offerings, festivals, and ritual. Elora’s birthdate falls on Day 4 of Wither (noted here as her birth year is 91429). |
| Rain | High summer — storms, heat, rivers full | Maevis’s birthdate falls on Day 7 of Leaf (Air). Pirate Festival in Pegport (Neverland): Raucous annual competition. Maevis’s birth year: 91427. |
| Sun | Late summer — hot, dry, festival season | No specific festival noted. Market season across most of Once. |
| Heat | End of summer — harvest preparations begin | The world prepares for Reap. Merchants stock for the winter months. |
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