Predict major and minor wildlife activity periods based on moon phase and position — plan your best days in the field.
Developed by John Alden Knight in 1926, solunar theory holds that fish and game are most active during predictable windows tied to the moon's position relative to Earth. Major periods occur when the moon is directly overhead or underfoot — each lasting roughly two hours. Minor periods align with moonrise and moonset, offering one-hour windows of elevated activity. Combine moon phase with these periods to pinpoint the best times to be in your stand or on the water.
John Alden Knight compiled 33 known factors that affect fish and game activity, eventually distilling them into three primary influences: sun position, moon position, and moon phase. His resulting solunar tables have been used by hunters and anglers since 1936 to predict peak wildlife movement.
Major Periods — The two strongest windows each day:
Minor Periods — Moderate activity windows:
Best Days of the Month: Activity ratings spike in the 2 days before and after a new moon and full moon. These are the highest-rated solunar days. Quarter moon phases produce average activity.
Practical Tips:
Many experienced hunters and anglers swear by solunar tables, and there is scientific basis for gravitational influence on animal behavior — the same forces that create ocean tides affect all water, including the water in living organisms. While solunar predictions are not foolproof, consistently planning hunts around major periods gives you a statistical edge.
Deer movement peaks in the 2-3 days surrounding a new moon and full moon. The new moon is often considered the best phase because daytime feeding activity increases when nights are darker. During the rut, however, buck movement can override moon phase entirely.
Major periods last approximately 2 hours centered on the moon's overhead or underfoot transit. Minor periods last about 1 hour centered on moonrise and moonset. Activity typically ramps up 30 minutes before the period peaks and tapers off 30 minutes after.
Absolutely — solunar theory was actually developed with fishing as the primary application. Bass, walleye, and most freshwater species show measurable feeding spikes during major solunar periods. See our Fishing Moon Phase Calculator for species-specific guidance.
Nocturnal periods are not wasted — they shift feeding pressure to the nearest dawn or dusk window as animals top off before or recover after peak nighttime activity. A midnight major period often means excellent early-morning hunting the next day.