Spring turkey calendar
Colorado has both Merriam's (western and southern mountains) and Rio Grande (eastern plains river drainages). The state's elevation range produces real timing variation — eastern plains breed first, western mountains last, with high-country birds not peaking until mid-May.
Breeding phases by zone
Phases are calendar approximations driven by photoperiod — year-to-year variation is small. Peak Breeding is the toughest phase for call-response hunting; Gobbling and Post-breed are the best.
Mountain West / Merriam's
Gobbling / pre-breed
Apr 5 – Apr 25
Peak breeding
Apr 26 – May 18
Post-breed / nesting
May 19 – Jun 7
Late season
Jun 8 – Jun 25
Merriam's · Western & Southern CO Merriam's
Southern Plains / Rio Grande
Gobbling / pre-breed
Mar 5 – Mar 28
Peak breeding
Mar 29 – Apr 18
Post-breed / nesting
Apr 19 – May 8
Late season
May 9 – May 31
Rio Grande · Eastern Plains Rio Grande
What drives turkey timing here
Merriam's country runs across a wide latitude range, but elevation is the dominant variable. Lower-elevation valleys peak first in late April, with high-elevation timber not peaking until mid-to-late May. Plan zones for elevation, not just latitude.
Photoperiod (day length) is the primary trigger — same week of April year over year produces the same calling response, give or take a few days. Weather pushes the window early or late at the margins.
Source
Data sourced from Colorado Parks and Wildlife wild turkey program reports.
Always verify season dates and licensing requirements with the official agency before hunting. Season structures change year to year.
Statewide phases are a starting point. Bield: Hunt logs your own observations — toms heard, hens seen, locations, conditions — and turns multi-season data into patterns no generic calendar can match.
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