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All non-dictatorial voting rules are susceptible to be manipulated by a group of agents; however, some voting rules are more vulnerable to strategic manipulation than others. The vulnerability of a voting rule to manipulation can be evaluated by the frequency of unstable voting situations where manipulation is possible. In this paper, we evaluate the vulnerability of evaluative voting (2,1,0)—hereinafter EV—to strategic manipulation by coalitions of voters when voter preferences are trichotomous and three candidates are in contention. In order to compare the performance of EV to that of plurality rule, antiplurality (or negative plurality) rule, and Borda rule, we also compute the theoretical frequency of unstable voting situations for each of these three voting rules when they are extended to the trichotomous framework. JEL classification codes: D71, D72