El Yunque Forest Road 988 (Caimitillo Trail)
Rainforest summit through the Caribbean's only temperate zone
Forest Road 988 cuts through the heart of El Yunque National Forest, climbing 2,000 feet through dense rainforest canopy to the Caimitillo summit radio towers. The 8-mile route starts near the Yokahu Observation Tower on PR-191, immediately plunging into muddy switchbacks where tree roots create natural rock steps and seasonal streams cross the trail. The notorious “Mud Bowl” section at mile 4 has swallowed stock SUVs whole during wet season, while the final push to Caimitillo’s 2,750-foot peak requires careful line choice through boulder gardens.
This is legitimate moderate-to-difficult terrain requiring high-clearance 4WD with good approach angles — experienced drivers only. Trails stay slick year-round due to 240+ inches of annual rainfall, but dry season (February-April) offers the best conditions. No permits required, but respect closure signs during heavy rain events. The payoff includes sweeping views of the Caribbean and rare glimpses of El Yunque’s endangered coquí frogs echoing through pristine rainforest canopy.
Trail Specs
| Difficulty | Moderate |
|---|---|
| Trail Type | Technical 4x4 |
| Surface | Dirt |
| Features | Remote, Scenic, Water Crossings |
| Length (miles) | 8 mi / 12.9 km |
| Duration | Half day |
| Max elevation (ft) | 2750 ft |
| Best season | February-April |
| Minimum vehicle | High-clearance 4WD |
| Nearest town | Río Grande, Puerto Rico |
| Land manager | US Forest Service |
| Permit required | No |
| Cell service | Spotty |
| Water crossings | Yes |
| Dispersed camping | No |
| Official sources | fs.usda.gov |
| Start coordinates | |
| End coordinates | |
| Copy both for Google Maps directionsClick to copy the directions URL · or open it directly in a new tab | |
| Find on Google | Search on Google → |
Location
Trail Conditions
No recent condition reports. Be the first to post one.
Log in to post a condition report.
Frequently asked questions
Can a lifted Tacoma or 4Runner handle FR-988, or do I need a dedicated crawler?
A stock high-clearance 4WD with good all-terrain tires can manage it, but the mud gets deep and the crossings get slippery — a lift and lockers give you real margin. Low-range is non-negotiable; don't attempt this in a crossover or street-tire setup.
What's the trail like during rainy season — is it even driveable?
El Yunque gets over 200 inches of rain per year, and FR-988 turns into a mud pit from May through January. February through April is the driest window; even then, expect wet conditions and swollen crossings after any overnight rain.
Do I need a permit to drive FR-988 into El Yunque?
The El Yunque National Forest doesn't currently charge a vehicle permit fee for FR-988, but access is managed by the USFS and the road can be gated closed without notice — call the Río Grande ranger district or check fs.usda.gov/elyunque before you leave.
What's the hardest section on this trail and what makes it technical?
The muddy climbs in the upper third toward Caimitillo summit are where rigs get stuck — steep grades combined with slick clay soil kill momentum fast. The river crossings lower on the trail are manageable but can rise quickly after rain, so read the water before you commit.
Is there cell service on the trail if something goes wrong, and can I camp in the forest?
Cell service is spotty to nonexistent once you're into the forest — don't count on a signal for navigation or emergency calls, bring a GPS device or satellite communicator. Dispersed camping is not permitted in El Yunque National Forest; you'll need to stay at established campgrounds or base out of Río Grande.
Trail track
No GPX track for this trail yet. If you've driven it and have a track, contribute below.
Log in to contribute a GPX track.