A widespread species, in the absence of evidence of any rapid declines this species would likely be Least Concern.
This is a very widespread species with records across the globe (see GBIF; Amanita muscaria (L.) Lam., 1783 in GBIF Secretariat (2019). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2019-11-12).
With such a wide distribution the population size is considered to be extremely large.
Population Trend: Stable
In Europe, this species grows in mixed woodland, and in associated with birch and pine (Sterry 2011).
Sterry, P. (2011). Fungi of Britain and Northern Europe. Bounty Books, London (first published 1991, Hamlyn).