This paper investigates the impact of surprises associated with monthly macroeconomic news releases on Treasury-bond yields, by paying particular attention to the moment at which the information is published in the month. Implementing an event study on intraday data, we show that (i) the main bond market movers are based on economic activity and in ation indicators, (ii) long-maturity bonds are slightly more impacted by surprises than short-maturity ones, and (iii) the bond market is more sensitive to bad news than to good announcements. Finally, we evidence an empirical monotonic relationship between the surprises' impact and their corresponding news' publication date and/or their sign.