Trat to Nakhon Nayok Road Trip Guide: Best Stops & Tips

The route from Trat to Nakhon Nayok (approximately 310 km via Highway 317 and 33) passes through three distinct provinces—Trat, Chanthaburi, and Prachinburi—before reaching the foothills of Khao Yai. Notably, along this drive you cross the Tropic of Cancer at a roadside marker in Chanthaburi, a rare geographic milestone for a road trip.

Driving time typically ranges from 4.5 to 5.5 hours, depending on traffic and stops, making it a manageable day trip or a leisurely two-day journey. This guide covers essential logistics, natural attractions, and practical tips for a smooth journey.

Highway 317 from Trat to Sa Kaeo is well-paved and lightly trafficked, while Highway 33 becomes busier as you approach Prachinburi. Fuel stations are plentiful along the route, with PTT and Bangchak stations roughly every 50 km. Diesel prices average 32 THB per liter, and a full tank (50L) costs about 1,600 THB.

Tolls apply only on the final stretch into Nakhon Nayok on Highway 9, with a single 50 THB fee at the Bangkhen checkpoint. For GPS, set your destination as 'Nakhon Nayok City Hall' to avoid getting lost in the province's rural grid.

• Highway 317 features a viewpoint at Khao Khitchakut, offering a clear sight of the Gulf of Thailand on clear days.
• Roadworks are common near Chanthaburi's gem district; allow 15 minutes extra speed.
• Mobile signal is strong throughout, with 4G coverage from all major Thai providers.

The drive transitions from coastal plains filled with rubber and oil palm plantations to fruit orchards and, finally, the forested mountains of Khao Yai National Park. In Chanthaburi, the landscape is dominated by durian and mangosteen orchards, and you can stop at roadside stalls to buy fresh fruit at 50-80 THB per kilogram.

UNESCO World Heritage Site Khao Yai National Park lies just south of Nakhon Nayok; its western boundary is accessible via a 30-minute drive from the city. The park's waterfalls, like Heo Suwat, are popular, but the entrance fee is 400 THB for foreigners.

Local commerce thrives in the town of Wang Nam Khiao, where a weekend market offers forest honey and bamboo shoots. For a deeper dive into finding off-the-beaten-path places, check this guide on how to find the best stops and hidden gems between cities.

Road quality is generally good, with well-marked lanes and adequate lighting near towns. However, be cautious of farm vehicles crossing at dusk, and always wear helmets if you're on a motorcycle. For families, the Chanthaburi Aquarium (open daily 9 AM-4 PM, 80 THB entry) offers an easy break with engaging exhibits.

Pet travelers are welcome at most roadside coffee shops, but keep them on a leash. For fatigue management, use the designated rest areas every 60 km; the most scenic is the Phra Phutthachai viewpoint on Highway 33, which also has a small cafeteria.

Hidden off-route, the Khao Ang Rue Nai Wildlife Sanctuary (just 15 km off Highway 33) offers a serene birdwatching tower, requiring no permit.