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We find significant evidence of structural breaks in the unconditional variance of seven of eight US dollar exchange rate return series over the 1980\u20132005 period\u2014implying unstable GARCH processes for these exchange rates\u2014and GARCH(1,1) parameter estimates often vary substantially across the subsamples defined by the structural breaks. We also find that it almost always pays to allow for structural breaks when forecasting exchange rate return volatility in real time. Combining forecasts from different models that accommodate structural breaks in volatility in various ways appears to offer a reliable method for improving volatility forecast accuracy given the uncertainty surrounding the timing and size of the structural breaks. 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