From Las Palmas de GC, take the Carretera General de Centro (GC-110) to San Mateo. Pass this town and continue on the same road until you see signs for Cueva Grande/ Pozo de las Nieves/ Roque Nublo. Take a left on GC-600 and continue until you see signs for Roque on your right (parking is on your left).
For more information you can purchase the guidebook from https://www.climbo.rocks
About a half hour approach hike from closest parking. Uphill for 1.5 km.