Canadian election campaigns often see a proliferation of political signs at the start of an election, but are they worth the effort? We examined official results at the poll level (N = 785) from elections agencies and the quantities of household signs recorded in internal political party databases (Green Parties of Canada, Manitoba, and Ontario). Overall, the results suggest that the use of household signs is an effective form of political campaigning in Canada for nongoverning parties. Analyses suggest that every sign placed per 100 registered electors is associated with an increase of 0.5–1.5 per cent vote share. The presence of household signs was associated with an increase of 1.5–3.4 per cent vote share. Further, preliminary evidence also suggests a possible diminishing returns trend: the per-sign rate of increase in vote share may slow down at higher densities. We discuss the implications of the results, including the possible curvilinear trend.
