The best time to go to Terelj is from May to early October, when the weather is most pleasant and the national park is fully accessible.
During these months, the temperatures are generally mild, ranging from comfortable highs in the summer to cooler, crisp days in the shoulder seasons. This period allows for a full range of outdoor activities, from horse riding and hiking to visiting the Aryabal Meditation Temple without the challenges of harsh winter conditions. The landscapes are lush and green in summer, transitioning to beautiful autumnal colours later in the year.
For adventurers and those keen on exploring the natural beauty, July and August are particularly appealing. The weather is at its warmest, making it ideal for longer treks or multi-day excursions into the park's more remote areas. Couples might enjoy the longer daylight hours for romantic walks and stargazing opportunities, as the skies are often clear.
For travellers who prefer a quieter experience and don't mind cooler temperatures, May, June, and September offer a wonderful alternative. The crowds are thinner, and the scenery remains stunning.