The trapped protons in the outer zone of the Van Allen radiation belt were measured on October 4, 1960, by means of a Scout rocket payload containing a two‐crystal scintillation spectrometer. Protons with energies above 1 Mev were detected, the intensity rising above background at an altitude of 1200 km. Representative intensities for 1≤Ep≤0 Mev at 2, 3, 4, and 5 times; 03km, through a range of 42°N to 30°N geomagnetic latitudes, were 0.27, 0.90, 2.02, and 4.56 times; 05protons/cm2sec ster. These intensities are averages for protons having pitch angles between 90° and ∼60°. The proton energy spectrum at 5000 km isJ(E)= 2.0 × 106E−5.2protons/cm2sec ster Mev for 1.02≤Ep≤2.24 Mev, andJ(E)= 0.71 × 106E−3.9for 2.24≤Ep≤7.3 Mev. The pitch angle distributions for altitudes of 4600 km and 5150 km were also obtained for angles between 90° and 58°. There was no evidence for a proton intensity maximum c