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At least half of a protostar's mass is accreted in the Class 0 phase, whenthe central protostar is deeply embedded in a dense, infalling envelope. Wepresent the first systematic search for outbursts from Class 0 protostars inthe Orion clouds. Using photometry from Spitzer/IRAC spanning 2004 to 2017, wedetect three outbursts from Class 0 protostars with $\ge 2$ mag changes at 3.6or 4.5 $\mu$m. This is comparable to the magnitude change of a knownprotostellar FU Ori outburst. Two are newly detected bursts from the protostarsHOPS 12 and 124. The number of detections implies that Class 0 protostars burstevery 438 yr, with a 95% confidence interval of 161 to 1884 yr. CombiningSpitzer and WISE/NEOWISE data spanning 2004-2019, we show that the burstspersist for more than nine years with significant variability during eachburst. Finally, we use $19-100$ $\mu$m photometry from SOFIA, Spitzer andHerschel to measure the amplitudes of the bursts. Based on the burst interval,a duration of 15 yr, and the range of observed amplitudes, 3-100% of the massaccretion during the Class 0 phase occurs during bursts. In total, we show thatbursts from Class 0 protostars are as frequent, or even more frequent, thanthose from more evolved protostars. This is consistent with bursts being drivenby instabilities in disks triggered by rapid mass infall. Furthermore, we findthat bursts may be a significant, if not dominant, mode of mass accretionduring the Class 0 phase.

The Rate, Amplitude and Duration of Outbursts from Class 0 Protostars in Orion