Does the Moon Affect Deer and Elk Movement?

GPS-collar studies on whitetails found little or no moon effect. Dawn, dusk and the rut move deer far more. No collar study has tested elk.

Short answer: the collar studies that tested the moon found nothing a hunter could plan around. All of them are on white-tailed deer. Nobody has published a comparable test on elk or mule deer that we could find.

Here is what each study did and what it found.

The biggest direct test: 48 Mississippi bucks

Mississippi State University put GPS collars on 48 white-tailed bucks in central Mississippi for two years. The collars took a location every 15 minutes from September through February. ^[1]

The researchers tested the popular theories one by one: moon phase, moon overhead or underfoot, moonrise and moonset, the moon's distance from Earth, and the combined "best day, best time" windows printed in hunting calendars. Each buck was compared with his own normal movement at the same time of day in a two-week window, so the rut and individual habits did not muddy the result. ^[1]

What they found:

• Moon phase did not change buck activity, in daylight or at night. ^[1]
• Moon position did not change buck activity. ^[1]
• Calendar windows that combine phase and position did not match more movement. ^[1]
• Bucks moved much more at dawn and dusk no matter what the moon was doing. ^[1]

To give the sizes: across the season these bucks were bedded about 34% of daylight and moved about 269 yards per hour in daylight. On the days rated best by moon phase, they were bedded 0.6% more than usual and moved 4 yards per hour less. The one measurable moon effect was that bucks bedded about 7 minutes later than usual when the moon was rising or setting. ^[1]

Compare that with the rut. In the rut the same bucks traveled over 100 yards per hour more than usual and spent about 10% less of the day bedded, which is more than an hour and a quarter. ^[1]

The same team surveyed 1,439 hunters. 83% believed the moon has some effect on deer activity. ^[1]

A second null: Oklahoma, seven years

An earlier peer-reviewed study tracked 17 does and 15 bucks in Oklahoma with 15-minute GPS fixes over seven years. Moon phase had no effect on daily movement, night movement or daytime movement. Short-term weather had an inconsistent effect. ^[2]

Deer in that study moved mainly at dawn and dusk. Bucks covered about 7,363 meters a day in the rut against 6,156 meters after it, roughly 20% more. ^[2]

The study that did find something

One study does report moon effects, and it is worth knowing about.

A master's thesis at Auburn University used 116 GPS-collared adult deer, bucks and does, tracked from 2009 to 2018 on one property in South Carolina. It found that moon phase, moon position and night brightness each affected activity in some seasons and at some times of day. On brighter nights deer were more likely to be active, and the effect was stronger in does. ^[4]

The catch is the size and the timing. The author reports that these responses were usually smaller than the normal daily swing in activity, and that they showed up mostly outside the peak hours. ^[4] In other words, the moon nudged deer a little at times when they were not moving much anyway. Dawn and dusk stayed dawn and dusk.

So the honest summary is not "the moon does nothing." It is: one large study found small, inconsistent effects, two found none, and no study found an effect big enough to pick a hunting day by.

What moves deer instead

Time of day. Every study above found the same daily pattern: most movement around sunrise and sunset. ^[1][2][4]

The rut. Mississippi bucks went from about 4,800 yards a day before the rut to over 7,500 yards a day at its peak. ^[3] That is a far bigger change than anything tied to the moon.

Rain, a little. The National Deer Association summarized Penn State's collar work in Pennsylvania: bucks cut their movement by as much as half on rainy days, does did not change, and a strong wind cancelled the rain effect. Seven deer followed through an October cold front showed no overall change in movement before, during or after it. ^[5] That is a second-hand summary and the cold-front sample is tiny, so treat it as a lead.

What about elk and mule deer

We found no GPS-collar study that tested moon phase on elk or mule deer. That is a gap in the research, not evidence either way.

What collar data do show for elk is the same daily rhythm. At the Starkey research forest in northeast Oregon, six years of tracking cow elk and mule deer does found sharp movement peaks at dawn and dusk for both species. The peaks were strongest in spring and autumn. Elk reached about 7 meters per minute at the peaks and mule deer about half that. ^[6] That study did not test the moon.

What this means for your hunt

• Do not move a hunt date for the moon. The best direct evidence says phase and position do not change daylight buck movement.
• Be in place before first light and stay through last light. That pattern held in every study.
• Plan around the rut calendar for your area before anything in the sky.
• If you have always believed a full moon makes for slow mornings, the whitetail data do not back it. For elk, nobody has checked.

What this does not tell you

• Nothing here was measured on elk or mule deer. Carrying a whitetail result over to a bull in the Rockies is a guess.
• All three deer studies are from the South or southern plains: Mississippi, Oklahoma and South Carolina. Northern herds and western terrain were not tested.
• Collars measure movement, not sightings. A deer can move the same distance in thicker cover and be harder to see.
• The Mississippi work is an extension publication, not a peer-reviewed paper. The Oklahoma study is peer reviewed. The South Carolina study is a thesis.
• None of these studies looked at hunter success by moon phase.

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Sources

1. Neary, N., Strickland, B., Resop, L., Demarais, S. and McKinley, W. (2025). Lunar Legends: Does the Moon Influence Buck Activity? Mississippi State University Extension Publication 4068. https://extension.msstate.edu/sites/default/files/publications/P4068_Lunar_web.pdf
2. Webb, S.L., Gee, K.L., Strickland, B.K., Demarais, S. and DeYoung, R.W. (2010). Measuring fine-scale white-tailed deer movements and environmental influences using GPS collars. International Journal of Ecology (abstract record). https://www.osti.gov/etdeweb/biblio/21387589
3. Strickland, B., Demarais, S., Cain, R., Chance, A., Henderson, C., Street, G., Resop, L. and McKinley, W. (2023). Understanding Buck Movement: How, When, and Why Bucks Navigate the Landscape. Mississippi State University Extension Publication 3927. https://extension.msstate.edu/publications/understanding-buck-movement-how-when-and-why-bucks-navigate-the-landscape
4. Goethlich, J. (2019). Effects of Abiotic Factors on White-tailed Deer Activity in South Carolina. Master's thesis, Auburn University. https://etd.auburn.edu/bitstream/handle/10415/7077/Goethlich_Thesis.pdf?sequence=2
5. Grossman, B. (2024). Does Weather Impact Deer Movement? Here's What We Know. National Deer Association. https://deerassociation.com/does-weather-impact-deer-movement/
6. Ager, A.A., Johnson, B.K., Kern, J.W. and Kie, J.G. (2003). Daily and seasonal movements and habitat use by female Rocky Mountain elk and mule deer. Journal of Mammalogy 84(3):1076-1088 (agency copy). https://www.dfw.state.or.us/wildlife/research/docs/MULEDEER%20Daily%20ans%20seasonalmovementsandhabitatusebyRockyMtnelkandmuledeer.pdf