--- title: "Santos Mártires 2026: when and where it's a public holiday — festivos.io" description: "Santos Mártires is a local holiday in 3 municipalities, accounting for 2,867 residents in the 2025 register. In 2026 it falls on 31 August." source: "https://festivos.io/en/holiday/santos-martires" --- # Santos Mártires Santos Mártires is a local holiday in 3 municipalities — 2,867 residents in the 2025 register. In 2026 it falls on 31 August; below, where and when it's celebrated. - **Level:** Local holiday - **Date 2026:** Monday 31 August - **Municipalities:** 3 - **Residents · 2025 register:** 2,867 - **Where most:** Castilla y León (2) ## Santos Mártires in the working calendar In 2026, the dataset records Santos Mártires as a local holiday in 3 municipalities, accounting for 2,867 residents in the 2025 register. The most common date is 31 August 2026. 2 municipalities set it on another date. This comparison uses only the official working calendars incorporated into the dataset for each year. ## Demographics of the covered population Age, citizenship, birthplace and average-age structure from the 2025 Annual Population Census. | Demographic profile | % | | --- | --- | | Women / men | 48.4% / 51.6% | | Aged 0–14 | 12.2% | | Aged 15–64 | 62.3% | | Aged 65+ | 25.5% | | Foreign citizenship | 4.1% | | Born outside Spain | 7.5% | | Weighted mean age | 47.6 years | ### How it differs from its surroundings Comparison with Spain and with the aggregate of the 2 regions where it is observed. All five comparisons are population-weighted and use only the 2025 Annual Census. A positive sign means the covered population has a higher value than the benchmark. | Demographic profile | Covered population | Compared with Spain | Compared with its 2 regions | | --- | --- | --- | --- | | Aged 0–14 | 12.2% | -0.7 pp | +1.2 pp | | Aged 65+ | 25.5% | +4.8 pp | -1.2 pp | | Foreign citizenship | 4.1% | -10 pp | -4.3 pp | | Born outside Spain | 7.5% | -11.8 pp | -4.4 pp | | Weighted mean age | 47.6 years | +3.1 years | -0.7 years | The largest difference from Spain is in “Born outside Spain”: -11.8 pp. Sex comes from the 2025 municipal register; all other metrics come from the 2025 Annual Census. Each percentage uses the total from its own statistical operation. [INE municipal tables 68535 and 68541](). ## Dates of Santos Mártires In 2026 it falls on Monday 31 August in most municipalities. 2 move it to another date (when it lands on a weekend or by local agreement). | Year | Main date | Municipalities | | --- | --- | --- | | 2024 | Friday, 30 August | 3 | | 2025 | Friday, 29 August | 4 | | 2026 | Monday, 31 August | 3 | ## Official sources Official documents linked by the 2026 records. Dates can vary by territory; each municipality page preserves its specific source. Population: official municipal-register figures at 1 January 2025. [INE](). [INE municipal tables 68535 and 68541](). - [Gobierno de Cantabria — Calendario laboral (BOC)]() - [Junta de Castilla y León — Fiestas locales (datos abiertos)]() ## 3 municipalities celebrate Santos Mártires Its local holiday in 2026, by region. Each municipality links to its annual record and the available official source. Together, they account for 2,867 residents in the INE municipal register at 1 January 2025. **Castilla y León** (2): Arraya de Oca, Miño de San Esteban **Cantabria** (1): Val de San Vicente ## About Santos Mártires ### When is Santos Mártires in 2026? In 2026, Santos Mártires is mainly celebrated on 31 August 2026 (Monday). Some municipalities move it to another date on the working calendar. ### In how many municipalities is Santos Mártires a holiday? It's a local holiday in 3 municipalities in 2026, accounting for 2,867 residents in the 2025 register; mostly in Castilla y León (2 municipalities). ### Is Santos Mártires a national holiday? No. Santos Mártires is a local-level holiday: it's only a non-working day in the municipalities that set it as their local festival; each keeps its official source. ## Other holidays - Saint Isidore the Laborer (488 municipalities) - San Roque (278 municipalities) - Segona Pasqua (189 municipalities) - Martes de Entroido (186 municipalities) - San Isidro Labrador (163 municipalities) - San Blas (151 municipalities) - San Vicente Ferrer (142 municipalities) - San Pedro (136 municipalities) Per-municipality data with its official source (regional gazette). Every date is verifiable on the municipality page. Data from festivos.io — CC BY 4.0. --- Data: festivos.io — CC BY 4.0. Official source: State Official Gazette (BOE) and regional gazettes (Law 37/2007).