Pang Sida Trip
Butterfly Season, Early Rains

✍️ By Doctor Chat

🔄 Updated 21 Jun 2026

Pang Sida is a large park spanning Sa Kaeo into Prachinburi, part of the Dong Phaya Yen–Khao Yai World Heritage forest complex. From Sa Kaeo town you drive north on Highway 3462 for about 27 kilometers to reach the headquarters — closer to Bangkok than you'd think. It's roughly a 3.5- to 4-hour drive from Bangkok, which makes it a good weekend trip if you want to escape into real forest without going far.

The heart of this trip is timing. The butterflies only come out in big numbers in the early rainy season, and they only come down to drink at the salt licks during the sunny late morning. The waterfalls are at their best in this same window too, since the water has just arrived. So the plan is to watch butterflies from morning until noon, then head to the falls in the afternoon.

Why go in June–July

Pang Sida's butterflies are out in the greatest numbers from mid-June to late July, because it's the start of the rainy season — the soil is damp, plants put out fresh shoots, and the caterpillars grow up and emerge as butterflies all at once in a big generation. That's why the park holds its annual butterfly-watching season then. Pang Sida has more than 500 recorded butterfly species, from swallowtails and birdwings to the tiny ones that come down to drink water in swarms.

• Peak window — late June to mid-July; if the rains come on time, the butterflies are at their most abundant
• Best time to watch — around 9am–noon, when the sun comes out after a night of rain and the butterflies gather at the salt licks
• The trade-off — it's the rainy season, some paths are slippery, and certain falls may close if the water surges; go in knowing nature is out of anyone's control

Fees, opening hours, getting there

• Entry (Thai nationals) — adults 40 THB, children 20 THB · foreigners adults 200, children 100 THB
• Vehicle fee — charged per car at the park's rate (a sedan is a few tens of baht)
• Opening hours — daily 8:30am–4:30pm, but if you're camping overnight you can stay on
• Getting there — from Sa Kaeo town take Highway 3462 north for 27 km; the park is on the right and well signed
• Transport — you really need your own vehicle; there's no public transport inside the park and the distances between spots are too far to walk

The hour-by-hour 2D1N plan

This plan is built for self-drivers. You arrive at the park in the late morning of day one, in time for the midday butterflies, swim at the falls in the afternoon, then camp overnight. On day two you wake up early for the spots that take a longer walk, before heading home.

Which waterfalls to visit in Pang Sida

Lodging, camping, and what to pack

Pang Sida has both park bungalows and campgrounds. Book ahead through the Department of National Parks website at nps.dnp.go.th. The butterfly season is busy, so reserve several days in advance. There are two campgrounds: the Pang Sida ground (near the headquarters, the falls, and the butterfly salt lick) and the Huai Nam Yen ground, which is farther out and quieter. Tents and bedding are available to rent if you'd rather not haul your own.

• Clothing — light or bright colors help butterflies come closer; avoid all black · bring a rain jacket and something warm for the night you camp
• Footwear — non-slip or hiking shoes, since the rainy-season trails are slippery and muddy
• Repellent — you'll definitely want some, but it scares off butterflies while you're watching them, so apply it only in the evening and at night
• Water & food — bring some of your own drinking water and snacks; the park shops are limited and close early
• Cash — there's no phone signal at some spots, so carry cash for the entry fee and equipment rental

How to see the most butterflies

• Go between 9am and noon, when the sun is out after the rain and the butterflies gather at the salt lick to drink in swarms
• Stay still and don't chase them — butterflies spook easily; sit quietly for a while and they'll come to you
• Skip perfume, sprays, and strong-smelling creams; chemical scents make butterflies flee
• Bring a zoom lens or a good phone camera — butterflies are small and hard to shoot up close
• Respect nature: don't collect, don't catch, don't litter — Pang Sida is a conservation area

Extend your trip around Sa Kaeo

If you have more than two days, Pang Sida pairs easily with other sights in Sa Kaeo. On the way back, stop at Khao Chakan, a limestone mountain rising out of the fields, or carry on toward Aranyaprathet for street food and a wander through Rong Kluea Market. History buffs into the Khmer past can add Sdok Kok Thom temple — enough to round out a tidy 3-day trip.