What Is Overseeding on a Golf Course?
Overseeding: Spreading cool-season grass seed over dormant bermuda in fall to keep courses green through winter.
Overseeding — full definition
The practice of spreading cool-season grass seed (typically perennial ryegrass) over warm-season turf (bermuda) in the fall to maintain a green, playable surface through winter. When bermuda goes dormant and turns brown in November, the ryegrass takes over and keeps the course green until spring, when rising temperatures bring the bermuda back. Most courses in Florida, Arizona, Texas, and the Southeast overseed annually. Courses typically close for 2-3 weeks during the overseeding transition. The spring "transition" back to bermuda is one of the trickiest periods for course superintendents, as both grasses compete for dominance.
Overseeding — frequently asked
Overseeding — how does it work?
- Ryegrass seed is spread over dormant bermuda in the fall
- Ryegrass keeps the course green through winter
- Rising spring temperatures bring bermuda back to life
Overseeding — where and when?
- Florida, Arizona, Texas, and the Southeast — annually
- Courses close for 2-3 weeks during the overseeding transition (usually October)
Overseeding — why is the spring transition tricky?
- Both grasses compete for dominance as temperatures rise
- One of the trickiest periods for course superintendents
- Inconsistent playing surfaces until bermuda fully takes over
More on Overseeding
Overseeding is why a Scottsdale course closes for three weeks in October, and why it is green in January.
- Golf courses in ArizonaCheck dates before booking an October trip.
- Arizona golf weatherThe temperature swing that drives the whole cycle.
- Bermuda grassThe turf that goes dormant underneath.
Other grass types
Bermuda Grass
The dominant warm-season turf across the southern United States — dense, grainy, and affects ball roll.
Bentgrass
The preferred putting green grass in the northern U.S. — ultra-smooth, fast, and true-rolling.
Poa Annua
Annual bluegrass — considered a weed on most courses, but the intentional putting surface at Pebble Beach and top West Coast tracks.
Zoysia
A warm-season grass popular in the transition zone — handles both heat and cold better than alternatives.
Ryegrass
A cool-season grass used as permanent turf in the north and as winter overseed in the south.
Paspalum
A salt-tolerant warm-season grass for coastal and island courses — can survive ocean spray and brackish water.
Fescue
A cool-season grass family — fine fescue creates the iconic golden links-style rough, tall fescue is used on fairways.
Kentucky Bluegrass
The backbone of northern fairway turf — dense, self-healing, and provides clean lies.