Mountain Day (Aug 11): Japan's Newest Holiday and Summer Hiking Tips

What is Mountain Day?

Mountain Day, or Yama no Hi, is a relatively new national holiday in Japan, officially established in 2014 and first observed in 2016. The purpose of the holiday is to provide an opportunity to get close to mountains and appreciate their benefits. Because the holiday is fixed on August 11, it often precedes the Obon holiday period, making it a popular time for domestic travelers to visit mountain resorts and hiking trails across Japan.

If August 11 falls on a Sunday, the following Monday will be observed as a substitute holiday (furikae kyujitsu), ensuring the public gets a day off. This holiday is a great time to explore famous regions like the Japanese Alps or the volcanic landscapes of Hakone, but it requires careful planning due to the summer weather.

Summer Hiking Safety and Preparation

Hiking in Japan during August presents specific challenges. While the scenery is lush, the heat and humidity can be intense. To stay safe, follow these practical tips:

• Beat the Heat: Start your hike as early as possible to finish before the midday sun reaches its peak. Heatstroke is a serious risk on mountain trails.

• Hydration is Critical: Carry more water than you think you need. Electrolyte drinks (such as Pocari Sweat) are highly recommended to replace salts lost through sweat.

• Watch the Clouds: Summer in Japan is known for sudden, heavy rain and thunderstorms, often occurring in the afternoon. If you see dark clouds gathering, head back to the trailhead immediately.

• Sun Protection: Use high-SPF sunscreen, wear a wide-brimmed hat, and consider lightweight, long-sleeved UV-protective clothing.

• Check the Forecast: Always check the latest weather reports from the Japan Meteorological Agency before heading out.

Essential Gear for August Hikes

Even if you are only doing a short trek, your gear should account for the summer climate. Lightweight, moisture-wicking fabrics are better than heavy cotton, which stays wet and cold when you sweat. A lightweight rain jacket is mandatory, even if the sky is clear when you start, to protect against sudden downpours. Additionally, carrying a small first-aid kit and a portable power bank for your phone is highly recommended in case of emergencies.

Good to know

• Mountain huts: Many trails have mountain huts (yamagoya) where you can rest or stay overnight, but many require advanced reservations.

• Fees: Some popular areas may require parking fees or specific permits.

• Wildlife: Be aware of hornet nests and bear activity in certain regions; carrying a bear bell is common practice in many mountainous areas.

• Official Info: For specific trail conditions, check with local municipal offices or regional tourism boards.

Official information

• Prime Minister's Office of Japan
• Ministry of Foreign Affairs of Japan
• Japan National Tourism Organization (JNTO)

Rules and fees can change. Please confirm the latest details with the official sources above.