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Can Telescopes Be Left Outside? Our Advice

If you’re an astronomy enthusiast, you might be wondering whether it’s safe to leave your telescope outside. The short answer is yes, but with some precautions. While it’s tempting to leave your telescope set up and ready to go for your next stargazing session, there are some risks associated with leaving it outside.

One of the biggest risks of leaving your telescope outside is exposure to the elements. Rain, snow, and even dew can damage the optics of your telescope over time. Additionally, extreme temperatures can cause damage to the telescope’s components, especially if it’s not designed to withstand the elements. However, with proper care and protection, you can safely leave your telescope outside without worrying about damage.

The Importance of Telescope Care

If you’re an avid telescope user, you know how important it is to take care of your equipment. Proper care and storage can extend the lifespan of your telescope and ensure it performs at its best. In this section, we’ll discuss the risks of leaving telescopes outside and the benefits of proper telescope storage.

The Risks of Leaving Telescopes Outside

Leaving your telescope outside can expose it to various elements that can cause damage or affect its performance. Here are some of the risks:

  • Humidity and Dew: Moisture can accumulate on your telescope’s lenses and mirrors, causing damage or leaving permanent spots.
  • Air Pollution: Dust and other pollutants can accumulate on your telescope, affecting its clarity and performance.
  • Insects and Animals: Bugs and animals can get inside your telescope and cause damage or leave debris.
  • Extreme Temperatures: Extreme heat or cold can damage your telescope’s components and affect its performance.

The Benefits of Proper Telescope Storage

Proper storage can help protect your telescope from the risks mentioned above. Here are some benefits of storing your telescope properly:

  • Extend Lifespan: Proper storage can help extend the lifespan of your telescope by protecting it from damage and wear and tear.
  • Improved Performance: Storing your telescope properly can help maintain its performance by keeping it clean and protected from the elements.
  • Easier Maintenance: Proper storage can make maintenance and cleaning easier and more effective.
  • Convenience: Storing your telescope in a convenient location can make it easier to use and access when you want to observe the night sky.

Factors to Consider When Leaving Telescopes Outside

Weather Conditions

The weather is one of the most critical factors to consider when leaving your telescope outside. Extreme temperatures, humidity, and moisture can all damage your telescope. High temperatures can cause the lubricants to evaporate, while low temperatures can cause the lubricants to freeze, making the telescope difficult to operate. Humidity and moisture can cause rust and damage to the internal parts of the telescope.

It is best to cover your telescope with a waterproof cover to protect it from the elements. You can also use a dew shield to protect the telescope from dew and moisture. A dew shield is a tube that fits around the front of the telescope to prevent moisture from settling on the lens.


The location where you leave your telescope outside is also an essential factor to consider. If you live in an area with high air pollution, dust, or insects, it is best to keep your telescope indoors. These elements can scratch the surface of the lens or mirrors, which can affect the clarity of the image.

If you live in an area with high winds, it is best to secure your telescope to prevent it from being blown over. You can use sandbags or weights to keep the tripod stable.

Type of Telescope

The type of telescope you have is also an important factor to consider when leaving it outside. Refractor telescopes, which use lenses to gather and focus light, can be left outside as long as they are covered and protected from moisture. However, reflector telescopes, which use mirrors to gather and focus light, are more delicate and should be kept indoors when not in use.

If you have a computerized telescope, it is best to cover the electronics with a waterproof cover to protect them from moisture. You can also use a power source that is designed for outdoor use to power the telescope.

Tips for Leaving Telescopes Outside

Covering the Telescope

One of the best ways to protect your telescope from the elements when leaving it outside is by using a sturdy and durable cover. A cover can help prevent dust, dew, moisture, insects, and other debris from damaging your telescope.

When choosing a cover, look for one that is made of heavy-duty reflective, tear-resistant fabric and has a waterproof lining. The Orion Scope Cloak is a good option that many astronomers recommend.

Cleaning the Telescope

Regular cleaning is essential to keep your telescope in good condition. When leaving it outside, you may need to clean it more often to remove any debris that accumulates on the lens or other parts.

Use a soft brush or cloth to remove any dirt or dust from the lens and other parts of the telescope. Avoid using any harsh chemicals or abrasive materials that could scratch or damage the lens.


Proper maintenance is crucial to keep your telescope working correctly when leaving it outside. Check the telescope regularly for any signs of wear and tear, and make any necessary repairs as soon as possible.

Keep the telescope well-lubricated to prevent any parts from sticking or wearing out. If you notice any problems with the telescope, such as difficulty focusing or blurry images, take it to a professional for repair.

Remember to store the telescope properly when not in use. Keep it in a dry, cool place, and cover it with a protective cover to prevent any damage.


Leaving your telescope outside can be a convenient option, especially if you use it frequently. However, it is important to consider the risks and take proper precautions to protect your telescope from weather conditions and other environmental factors.

If you decide to leave your telescope outside, make sure it is covered with a telescope cover or stored in a weatherproof outdoor structure like an observatory or a shed. This will protect it from air pollution, insects, rain, dew, and other forms of dust.

Remember that moisture, fog, or morning dew can accumulate in the lenses and leave permanent spots in the optics. Dust can also accumulate in the mirrors, which should not be wiped as it may leave a scratch. Instead, use a blower brush or compressed air to remove dust.

Overall, it is recommended to store your telescope indoors when not in use to prolong its lifespan and ensure its optimal performance. However, if you must leave it outside, take the necessary precautions to protect it from the elements.