Some time ago, I discovered that the GR-131 had been blocked by a vineyard development just south of San Bartolomé.

Path Closed.
La Voz- la reapertura del camino rural GR-131
As of 1st of July 2025 according to a La Voz article this problem has been resolved. https://www.lavozdelanzarote.com/actualidad/politica/san-bartolome-logra-acuerdo-reapertura-camino-rural-gr-131_236073_102.html.
El alcalde de San Bartolomé, Isidro Pérez.
The mayor of San Bartolomé, Isidro Pérez

El alcalde de San Bartolomé, Isidro Pérez, explicó que se ha trabajado de la mano con el propietario de la parcela de titularidad privada, ya que se entendía que el cierre del camino era en perjuicio al interés general
El Ayuntamiento de San Bartolomé ha logrado un acuerdo para la reapertura del camino rural GR-131, un sendero ubicado en la zona de la Montaña Guatisea, en San Bartolomé, que forma parte a su vez del sendero más largo y uno de los más transitados de Lanzarote.
En ese sentido, ambas partes han considerado oportuno y por ello convienen el contrato de cesión de uso gratuito por parte del Ayuntamiento de San Bartolomé, abriendo paso a que el GR-131 vuelva a estar operativo.
The mayor of San Bartolomé, Isidro Pérez, explained that they have worked hand in hand with the owner of the privately owned plot, since it was understood that the closure of the road was detrimental to the general interest.
The San Bartolomé City Council has reached an agreement to reopen the GR-131 rural trail, a path located in the Guatisea Mountain area of San Bartolomé, which is also part of the longest and one of the busiest trails in Lanzarote.
In this regard, both parties have deemed it appropriate and therefore agreed to the free use contract granted by the San Bartolomé City Council, paving the way for the GR-131 to become operational again.
Revisiting the walk
I walked the route on the 8th of July 2025. Although an opening had been made in the fence, it wasn’t very official-looking. Posts had been ripped up and left scattered on the ground, and no official signage. Also, if you walk from the C. Timanfaya direction, there are still signs declaring no through route. This despite the path marked with the official GR-131 route sign.
I will be making a return visit shortly to see if the situation has improved.