Quick Answer
Fencing on rocky, steep, or densely vegetated terrain requires specialized equipment beyond the basic post driver and wire stretcher. Key additions: a hydraulic rock drill or rotary hammer for rocky ground, a brush hog or chainsaw for clearing dense vegetation, and a skid steer or ATV with post driver attachment for steep slopes where a standard tractor can't operate safely.
Rocky Terrain Equipment
Hydraulic rock drill (pneumatic or electric): Drills holes in bedrock for post placement. Rental: $150–$300/day. Required when shallow soil over rock prevents standard post setting. Drill holes 2–3 inches wider than the post diameter and 18–24 inches deep; fill with fast-set concrete after post placement.
Rotary hammer drill: Smaller than a full hydraulic drill but adequate for drilling anchor bolt holes in exposed rock outcrops. Cost: $200–$400 to purchase; rental available. Useful for surface-mount anchor plates where posts can't be driven.
Breaker/chisel attachment (for skid steer or excavator): Breaks up rock to create a post-setting trench. Most useful when running fence over a stretch of rocky ground rather than isolated outcrops.
Steep Slope Equipment
ATV with post driver attachment: Provides access on slopes where a tractor would tip. Works on slopes up to 35–40 degrees. Rental: $200–$400/day. Purchase: $8,000–$20,000 for a quality ATV post driver system.
Cable winch (tractor-mounted): Required for pulling wire up steep slopes where direct-drive wire stretchers can't maintain consistent tension. Also useful for preventing tractor runaway on descents while unrolling wire.
Dense Vegetation Equipment
Brush hog/rotary cutter: Clears 2–4-inch diameter brush along fence lines. 3-point hitch mounted; requires 25+ HP tractor. Must pre-clear before post driving — driving through dense brush damages post driver equipment.
Chainsaw: For larger trees along the fence line. Clear a 6-8 foot swath centered on the fence line for post access and future maintenance. Stumps left below fence level don't require removal.
Daily Equipment Cost Estimates
| Equipment | Rental/Day | Production |
|---|---|---|
| Tractor post hole auger | $80–$150 | 200–400 holes/day |
| Hydraulic rock drill | $150–$300 | 20–60 holes/day |
| ATV post driver | $200–$400 | 150–300 posts/day |
| Brush hog (with tractor) | $150–$300 | 1–3 miles/day |
Our Recommendation
Get an accurate terrain assessment before deciding to DIY vs. hire a professional for difficult terrain. Rocky or extremely steep terrain adds 50–200% to installation time and cost — factors where professional crews with the right equipment are often more economical than rental plus labor. For gently-to-moderately difficult terrain, renting appropriate equipment is still practical for DIY installation.