USAF · 1947 to 1969
Project Blue Book Case Files
The U.S. Air Force's 22-year investigation into reported UFO incidents, drawn from the National Archives. Each case below has a journalistic summary written from the original file. Use the search box to find a place or date, or filter by state and year.
21 cases in CO from 1956 · page 1 of 1
1 Mi E Of Denver, CO
1956 · unknownOn August 5, 1956, at 6:04 a.m. local time, one mile east of Denver, Colorado, a civilian observer reported seeing six round, pale orange colored objects flying in an approximate t…
Colorado Springs, CO
1956 · unknownOn October 1, 1956, in Colorado Springs, Colorado, two military and civilian witnesses observed one round flashing red and green object for two hours. The object appeared similar t…
Colorado Springs, CO
1956 · unknownOn May 9, 1956, a civilian in Colorado Springs, Colorado reported seeing one round object about the size of a small pea held at arm's length. The object was fluorescent white and s…
Colorado Springs, CO
1956 · unknownOn September 27, 1956, an observer near Colorado Springs, Colorado reported one round, bright object with an orange tinge and a blurred outline. It had an orangish tail about twent…
Colorado, Springs, CO
1956 · unknownOn August 18, 1956, a civilian in Colorado Springs, Colorado, reported a single object. The sighting was recorded at 1020Z and lasted about four minutes. It was still visible when…
Craig, CO
1956 · unknownOn September 27, 1956, a civilian near Craig, Colorado reported about fourteen lights arranged in a string. The lights were uniform in spacing and looked like a row of cabin lights…
Crestone, CO
1956 · unknownOn August 28 to 30, 1956, a civilian in Crestone, Colorado, reported a single object on several nights. On August 28 it was watched for about one hour and fifty-nine minutes and wa…
Denver, CO
1956 · unknownOn the evening of December 31, 1956, a resident of Denver, Colorado watched two round objects in the night sky through binoculars and a telescope. Both objects were tiny, about the…
Denver, CO
1956 · unknownOn August 21, 1956, at about 11:50 a.m., a civilian in Denver, Colorado observed one object in the sky. The object was oval or shaped like a coffee saucer and appeared white. At fi…
Denver, CO
1956 · unknownOn October 4, 1956, a civilian near Denver, Colorado reported one round, red object about the size of a pen held at arm's length. The object was seen to the west of the observer at…
Denver, CO
1956 · unknownOn September 1, 1956, a civilian in Denver, Colorado, reported a single object. The sighting was recorded at 0310Z and lasted about one hour and ten minutes. The witness described…
Fountain, CO
1956 · unknownOn August 22, 1956, a civilian in Fountain, Colorado, reported a single object. The sighting was recorded at 1050Z and lasted about thirty-five minutes. It disappeared after sunris…
Ft. Collins, CO
1956 · unknown# Summary On the evening of September 24, 1956, a witness in Fort Collins, Colorado saw an unusual object in the sky. The object appeared round, about the size of a baseball, and…
Hosperus, CO
1956 · unknownOn August 1, 1956, a civilian observer in Hosperus, Colorado reported seeing one yellowish funnel-shaped object. The observation was ground-visual. The object appeared stationary a…
Hugo, CO
1956 · unknownOn December 2, 1956, near Hugo, Colorado, a civilian observer reported seeing three white to yellowish lights. The objects appeared as one object that graduated in size from pea to…
Peyton, CO
1956 · unknownOn the nights of September 1, 2, and 3, 1956, observers near Peyton, Colorado reported lights in the sky starting around 7 p.m. local time. Watchers used binoculars and saw the obj…
Pueblo, CO
1956 · unknownOn September 1, 1956, a civilian ground observer in Pueblo, Colorado, reported four objects. The sighting was recorded at 0513Z and lasted about two hours. The witness described f…
Pueblo, CO
1956 · unknownOn August 29, 1956, a military witness in Pueblo, Colorado, reported a single object. The sighting lasted about two hours and twenty-one minutes. The witness described one round o…
Pueblo, CO
1956 · unknownOn October 1, 1956, at 2:53 a.m., a civilian in Pueblo, Colorado reported observing one round object resembling a star with a cream color. The object was approximately the size of…
Pueblo, CO
1956 · unknownOn August 11, 1956, in Pueblo, Colorado, a civilian observer reported seeing six to eight objects with greenish glow in a very formation. The objects were about the size of a half…
Rocky Ford, CO
1956 · unknownOn November 12, 1956, at Rocky Ford, Colorado, a civilian observer reported three objects about the size of a dime, colored red, yellow, and green, arranged in a stationary formati…
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