Thornewood Preserve

Midpen trails and facilities are generally very safe. However, you are entering an environment where there are some naturally occurring hazards. Reasonable caution and common sense should be utilized when venturing into any outdoor environment. 

• Do not leave valuables in your vehicle! Lock your vehicle and store valuables out of sight or take them with you on the trail.
   
• Travel in groups of two or more. Two of more people can assist each other in the event of an accident or emergency.
   
• Dress for the environment. Temperature changes can be occur and you should dress in layers appropriate for the location, time of year and planned activities. 
   
• Carry water with you. Drinking water is not available at most Midpen preserves so you should bring your own. Two quarts per person per two hour hike is recommended.
   
• Apply sunscreen and drink plenty of water prior to and during your outdoor activities.
   
• Be aware that cell service is very sporadic on the preserves. 

Be Prepared and Aware 

• Plan ahead before you leave. Check regulations and weather, download a map, pack water and first aid. 

• Know your limits and take safety precautions. 

• Rattlesnakes are native to this area and are especially active in warm weather. 

• Poison oak grows on most preserves: Learn to identify and avoid it in all seasons. 

• Ticks are present in this area and may carry diseases. 

• Mountain lions are a natural part of this region’s environment and are occasionally seen. 

Share the Trail 

• Use designated trails to avoid damage to natural resources and prevent injury. 

• Avoid blocking the trail. Step aside to allow others to pass .  

• Whether you’re walking or biking, always yield to equestrians. 

• When biking (where allowed), obey speed limit and ride in control. Avoid startling hikers and equestrians by announcing your presence when approaching from behind. 

• When visiting with dogs (where allowed), follow dog access guidelines available at openspace.org/dogs. 

• Leave no trace. Pack out what you pack in. Most preserves do not have trash cans. Littering is prohibited. 

• Abuses of trail etiquette should be brought to the attention of a ranger or call the Midpen main office at 650-691-1200. 

In Case of Emergency 

If you experience an emergency (fire, accident or other immediate threat to life or property), call 911. For nonemergencies, call 650-691-1200.