R & E: Arrives at the beginning of April in the south and by mid-April in the north. Peak is in early May when huge flocks may be seen roosting in chimneys.

March 20, 1963 - Earliest spring record
(1); Charleston, Mississippi Co.; Jim Haw; R & E, BB 30[2]:26.

May 7, 1967 - Highest single day count
(3500 - 4000); Univ. of Missouri - Columbia campus, Boone Co.; M. Entrikin; R & E, BB 34[2]:8.

May 20, 1967
(Male); Specimen (NWMSU, NHL 6); Maryville, Nodaway Co.; R & E.

June 1936 - One of the last reports of this species nesting in natural sites
(Nesting pair); Swope Park, Jackson Co.; Walter Cunningham; R & E, Rising et al. 1978. Presumably this species still nests in natural cavities

R & E: Common summer resident. Undoubtedly this species has increase dramatically since the state was settled. Prior to settlement, this species primarily used hollow trees and cliff faces for nesting.

R & E: Birds begin congregating at roosts by mid-Aug., and their numbers build through Sept. Relatively large numbers are regularly seen into early Oct., with an occasional large flock seen at roosts sites in mid-Oct. However, normally it is rarely seen in the state after the third week in Oct.

Sept. 28, 1975 - 2nd highest single day count and highest fall single day count
(3000-4000+); downtown Kansas City, Jackson Co.; Nanette Johnson; R & E, BB 44[1]:21.

Nov. 6 and 8, 1925 - 2nd latest fall record
(8 on Nov. 6 and 1 on Nov. 8); St. Louis; No observer listed; R & E, Widmann 1928.

Nov. 18, 1986 - Latest fall record
(1); Colulmbia, Boone Co.; Tim Barksdale; R & E, BB 54[1]:34.

Dec. 1938 - Accepted to provisional list only
(1); near Parkville, Platte Co.; Walter Cunningham, A. Shirling; R & E, Rising et al. 1978. No details were given for this observation, thus precluding the elimination of the very similar Vaux's Swift, which is just as likely to occur in Missouri at this time of year.

Note: Any significant observations since R & E will be added at a later time.