The Robert Ferguson Observatory (RFO) is open to the public at least once a month, usually on a Saturday near the time of the New Moon.
Star Parties: Presentations on astronomical topics are given in the classroom throughout the course of the evening. Starting at dusk, the Observatory’s three main telescopes are open for your viewing. Docents set up additional telescopes in front of the building. Friendly and knowledgeable docents are available to answer your questions.
You must have a ticket to attend, as we are limited to 40 attendees per County Health Orders. Proof of vaccination or a negative rapid test taken within the last 48 hours are also required to attend.
FAQs:
- Map and Directions
- When to arrive: We keep the observatory open as long as there are visitors, but you must arrive within 3 hours after start time to ensure that we remain open for you. Summer Star Parties begin with tours and presentations until it’s dark enough for observing.
- Bring warm clothing, even in summer—observing is done outdoors.
- There is a short walk from the parking area to the Observatory and you may wish to bring a small flashlight.
- White Light: No white lights should be used after dark; the observatory is a red-light-only area to protect everyone’s night vision. We will supply red cellophane to cover flashlights. Please note:
◦ Bring a SMALL flashlight (large camp lanterns, light sticks, etc., cannot be adequately covered by red cellophane).
◦ Cell phones or cell-phone flashlights are acceptable but must be covered in red cellophane. (No cell service at the observatory).
◦ Some head lamps are difficult to cover with red cellophane. Once covered, head lamps should be worn around the neck or used pointing down as they are usually very bright at eye level.
◦ Red flashlights are available for $5 at the observatory. - Alcohol is prohibited on Observatory grounds.
- The Observatory is not open to the public except for scheduled events.
Classroom presentations are always offered on Star Party nights even if the weather is poor. For current conditions call the observatory at (707) 833-6979.
For more info please visit the Robert Ferguson Observatory website.

Enjoy your yoga experience in the beautiful setting of our park! Susan Topf’s Yoga Hike balances a mix of easy hiking and gentle yoga postures, breath work and guided meditation, no mat necessary. The route varies on weather conditions and group interest that typically covers 2-3 miles of varied terrain. All levels and ages welcome.
Tickets are $30 and include parking if registered in advance online. Please wear weather-appropriate clothing to feel comfortable being in a natural setting and bring water (as needed). Meet outside the Visitor Center unless otherwise noted in confirmation email prior to the hike. Limited to 12 participants.
Sonoma County Resident? Free with a October 2023 or newer Park Rx from a participating Sonoma County Medical Provider. Click here for Park Rx info.
Ease of access: we’re unable to determine ease of access as the route will be decided the day-of by the hike leader and other logistics (mud, small water crossings, slippery trails, etc).

Acompáñanos en una caminata única en Sugarloaf llena de curiodades escalofriantes, incluyendo relatos acerca de personas que fallecieron en el parque, los hábitos funerarios de los cuervos, y si es posible, observar murciélagos.
Nos reuniremos en el estacionamiento principal y seguiremos el circuito Hillside-Meadow. Por favor trae al menos un litro de agua, calzado apropiado para senderos resbaladizos, repelente de insectos o una playera de mangas largas, y una lámpara de mano, ya que la caminata terminará en el crepúsculo.
El evento es gratis pero requiere registración por adelantado ya que el espacio es limitado. El estacionamiento, usualmente $10, es gratis para este evento.
Para más información, manda un correo electrónico a senderos@sonomaecologycenter.org o llama a Alma al 707-247-5767.
Este evento es en colaboración con la Biblioteca Regional del Valle de Sonoma. Si vives cerca de la biblioteca, visítales o llámales para inscribirte al programa– ¡incluyendo transporte!
Facilidad de acceso: el sendero Hillside es una carretera de servicio con dos colinas de alrededor de 100 pies cada una y un pequeño cruce de riachuelo. El sendero Meadow es un camino de grava compacta plano. Carriolas o sillas de ruedas pueden avanzar alrededor de una milla en este sendero (desde el Observatorio), el cual no es oficialmente un sendero que cumple con los requerimientos de la Ley para Estadounidenses con Discapacidades (ADA). Este circuito de grava actúa como un cortafuegos, manejable por vehículos autorizados.
Encuentra más oportunidades recreacionales a través del programa Senderos Naturales en ésta página.
Para más eventos en Sugarloaf, visita nuestro calendario.
ENGLISH: Senderos: Fauna
Sat, 10/21, 4:00 – 6:00 pm
Join us in a unique hike at Sugarloaf full of spooky curios, including stories about characters who have met their end in the park, the funerary habits of crows, and if possible, we might observe some bats. This event is planned around a primarily Spanish-speaking Latino audience. Families from underrepresented groups are particularly welcome. Email senderos@sonomaecologycenter.org with your questions. This event is in collaboration with Sonoma Valley Regional Library. If you live near the library and need transportation, call or visit them to sign up for this program– and a ride!
Ease of access: Hillside Trail is a gravel and dirt road with two 100-ft hills and a small stream crossing. Meadow is a mostly flat composite trail manageable by strollers and wheelchairs from the trailhead to about a mile in, although officially not an ADA-compliant trail. The entire loop is a fire road sometimes driven by authorized vehicles.
Find more recreational opportunities through the Senderos Naturales program in this page.
For more events at Sugarloaf, visit our calendar.

¡Ven a conocer más acerca de nuestro universo! Los docentes del Observatorio Robert Ferguson (ubicado dentro del Parque Estatal Sugarloaf Ridge) nos guiarán en una charla astronómica bilingüe y en el uso de telescopios para que usted y su familia puedan observar el cosmos. El evento comenzará a las 7:00 pm en el aula del Observatorio con una presentación.
La admisión es $10 para adultos y gratuita para los menores de edad. Si posees una tarjeta de EBT, el dueño y tres familiares pueden asistir por gratis a través del programa Museums for All. Regístrate por adelantado ya que el espacio es limitado y se llenará pronto. Recomendamos asisitr abrigado, traer agua, una linterna pequeña de mano (para aluzar el camino, pero no puede ser usada cerca del Observatorio a menos que tenga un filtro rojo) y si la tienes, una guía al cosmos norteamericano. Nos reuniremos en el estacionamiento del granero blanco. El estacionamiento, usualmente $10, es gratis para este evento.
Para más información, manda un correo electrónico a senderos@sonomaecologycenter.org o llama a Alma al 707-247-5767. Condiciones lluviosas cancelan el evento.
Facilidad de acceso: el Observatorio Robert Ferguson se ubica dentro del Parque Estatal Sugarloaf Ridge. Cuenta con un espacio designado para estacionar vans que necesitan acceso y aunque no oficialmente, hay mucho estacionamiento que puede ser accesible en esa misma área y en el estacionamiento del granero blanco. Hay una rampa que oficialmente cumple con los requerimientos de la Ley para Estadounidenses con Discapacidades (ADA) para ingresar al observatorio. El área de asentamiento en el aula principal del observatorio está compuesto de sillas que fácilmente pueden moverse. Hay baños disponibles dentro del edificio, incluyendo uno accesible. El telescopio de la sala oeste tiene una rampa portátil, y el telescopio de la sala este es una pantalla grande instalada en la pared.
Encuentra más oportunidades recreacionales a través del programa Senderos Naturales en ésta página.
Para aprender más acerca de RFO, visita su página de internet. Para más eventos en Sugarloaf, visita nuestro calendario.
Cosmic Senderos
Sat, 11/3, 7:00-9:00 pm
Come learn more about our universe! Robert Ferguson Observatory (inside Sugarloaf Ridge State Park) docents will guide us in a bilingual astronomical presentation and in the use of telescopes for you and your family to observe the cosmos. The event begins at 8:30 p.m. in the Observatory classroom with a presentation.
Tickets are $10 per adult and free for children under 18 years old. If you have a current EBT card, the owner and three family members from the same household can register for free through the Museums for All Program. Please register in advance, as space is limited and this event will fill up quickly. This event is planned around a primarily Spanish-speaking Latino audience. Families from underrepresented groups are encouraged to attend. Wear layers, bring water, a small flashlight (for walking to the gate only; white light is not to be used around the Observatory unless it has a red filter). We’ll meet at the White Barn parking lot. Parking, usually $10, will be waived for this event thanks to the generosity of Sugarloaf Ridge State Park.
For more information, email us at senderos@sonomaecologycenter.org or call Alma al 707-247-5767. Rainy conditions cancel.
Ease of access: the Robert Ferguson Observatory is located within Sugarloaf Ridge State Park. There is one van-designated parking spot and although not ADA or van-designated, there is more parking adjacent to the Observatory/group camp and at the White Barn lot. The observatory has a wooden ramp from the designated parking space to the main level deck. Inside the classroom, seating is fluid and mobile. There is an accessible stall in the bathroom inside the building and an accessible porta-potty at the group camp (directly outside the observatory). The telescope in the west wing has a mobile ramp and the telescope in the east wing projects off a screen attached to the wall.
Find more recreational opportunities through the Senderos Naturales program in this page.
To learn more about RFO, visit their website. For more events at Sugarloaf, visit our calendar.
The Robert Ferguson Observatory (RFO) is open to the public at least once a month, usually on a Saturday near the time of the New Moon.
Star Parties: Presentations on astronomical topics are given in the classroom throughout the course of the evening. Starting at dusk, the Observatory’s three main telescopes are open for your viewing. Docents set up additional telescopes in front of the building. Friendly and knowledgeable docents are available to answer your questions.
You must have a ticket to attend, as we are limited to 40 attendees per County Health Orders. Proof of vaccination or a negative rapid test taken within the last 48 hours are also required to attend.
FAQs:
- Map and Directions
- When to arrive: We keep the observatory open as long as there are visitors, but you must arrive within 3 hours after start time to ensure that we remain open for you. Summer Star Parties begin with tours and presentations until it’s dark enough for observing.
- Bring warm clothing, even in summer—observing is done outdoors.
- There is a short walk from the parking area to the Observatory and you may wish to bring a small flashlight.
- White Light: No white lights should be used after dark; the observatory is a red-light-only area to protect everyone’s night vision. We will supply red cellophane to cover flashlights. Please note:
◦ Bring a SMALL flashlight (large camp lanterns, light sticks, etc., cannot be adequately covered by red cellophane).
◦ Cell phones or cell-phone flashlights are acceptable but must be covered in red cellophane. (No cell service at the observatory).
◦ Some head lamps are difficult to cover with red cellophane. Once covered, head lamps should be worn around the neck or used pointing down as they are usually very bright at eye level.
◦ Red flashlights are available for $5 at the observatory. - Alcohol is prohibited on Observatory grounds.
- The Observatory is not open to the public except for scheduled events.
Classroom presentations are always offered on Star Party nights even if the weather is poor. For current conditions call the observatory at (707) 833-6979.
For more info please visit the Robert Ferguson Observatory website.

Enjoy your yoga experience in the beautiful setting of our park! Susan Topf’s Yoga Hike balances a mix of easy hiking and gentle yoga postures, breath work and guided meditation, no mat necessary. The route varies on weather conditions and group interest that typically covers 2-3 miles of varied terrain. All levels and ages welcome.
Tickets are $30 and include parking if registered in advance online. Please wear weather-appropriate clothing to feel comfortable being in a natural setting and bring water (as needed). Meet outside the Visitor Center unless otherwise noted in confirmation email prior to the hike. Limited to 12 participants.
Sonoma County Resident? Free with a October 2023 or newer Park Rx from a participating Sonoma County Medical Provider. Click here for Park Rx info.
Ease of access: we’re unable to determine ease of access as the route will be decided the day-of by the hike leader and other logistics (mud, small water crossings, slippery trails, etc).
The Robert Ferguson Observatory (RFO) is open to the public at least once a month, usually on a Saturday near the time of the New Moon.
Star Parties: Presentations on astronomical topics are given in the classroom throughout the course of the evening. Starting at dusk, the Observatory’s three main telescopes are open for your viewing. Docents set up additional telescopes in front of the building. Friendly and knowledgeable docents are available to answer your questions.
You must have a ticket to attend, as we are limited to 40 attendees per County Health Orders. Proof of vaccination or a negative rapid test taken within the last 48 hours are also required to attend.
FAQs:
- Map and Directions
- When to arrive: We keep the observatory open as long as there are visitors, but you must arrive within 3 hours after start time to ensure that we remain open for you. Summer Star Parties begin with tours and presentations until it’s dark enough for observing.
- Bring warm clothing, even in summer—observing is done outdoors.
- There is a short walk from the parking area to the Observatory and you may wish to bring a small flashlight.
- White Light: No white lights should be used after dark; the observatory is a red-light-only area to protect everyone’s night vision. We will supply red cellophane to cover flashlights. Please note:
◦ Bring a SMALL flashlight (large camp lanterns, light sticks, etc., cannot be adequately covered by red cellophane).
◦ Cell phones or cell-phone flashlights are acceptable but must be covered in red cellophane. (No cell service at the observatory).
◦ Some head lamps are difficult to cover with red cellophane. Once covered, head lamps should be worn around the neck or used pointing down as they are usually very bright at eye level.
◦ Red flashlights are available for $5 at the observatory. - Alcohol is prohibited on Observatory grounds.
- The Observatory is not open to the public except for scheduled events.
Classroom presentations are always offered on Star Party nights even if the weather is poor. For current conditions call the observatory at (707) 833-6979.
For more info please visit the Robert Ferguson Observatory website.