When is Los Tres Miles 300m peak ridge traverse possible for non mountaineers?

[El Perro Negro]

You can normally complete this and bypass any remaining snow between June and October inclusive. In most years it can be done in May and November but this does depends on late season and early season snowfall.

Up to April and from December onwards the ridge is best left to experienced mountaineers when the full traverse is a full on winter mountaineering challenge.