Arenal is rainforest, and the single fact that should shape your packing is that it rains here in some form on most days of the year, including in the dry season. Temperatures are pleasant and stable, roughly 22°C to 30°C year round, but the humidity sits high enough that nothing dries properly and a cotton shirt hung overnight will still be damp in the morning. Pack quick drying fabrics, a genuinely waterproof jacket rather than a shower resistant one, two pairs of footwear so one can dry, and fewer clothes than you think.
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The second thing to understand, because it disappoints people who arrive expecting otherwise, is that Arenal is not currently an erupting volcano. It was spectacularly active from 1968 until 2010, throwing lava down its flanks most nights, and that is the Arenal in most of the photographs. Since 2010 it has been in a resting phase. What you get now is a near perfect volcanic cone above rainforest, geothermally heated rivers, and a national park of lava fields from the old flows, which is genuinely worth the trip. What you do not get is glowing lava, and no tour can sell you one.
What Makes Arenal Different to Pack For
It rains, and the seasons are relative
La Fortuna sits on the wet Caribbean side of the divide, and the drier months, roughly February to April, mean less rain rather than none. The wettest stretch runs September through November, when afternoon downpours are heavy and daily. Even in March, expect cloud most mornings and rain at some point.
That makes a packable rain jacket the single most used item in the bag, worn most days. An umbrella is close to useless on a hanging bridge or a waterfall staircase, and a poncho traps heat in this humidity. A lightweight breathable shell you can stuff in a day bag is the right tool.
Nothing dries, so pack for it
In near constant humidity, wet clothing stays wet. The practical answer is fabric choice rather than volume: thin synthetics and merino dry in hours where cotton and denim take days. Pack three or four quick drying tops rather than seven cotton ones, and accept that laundry in La Fortuna means a same day service rather than a sink.
A quick dry travel towel is genuinely better than the hotel towel here, and you will use it at the waterfall, the hot springs and the river. Bring a dry bag or two heavy zip bags for wet swimwear and a phone.
The volcano is usually hidden
Arenal generates its own cloud, and the summit is clear far less often than the brochures suggest. Early morning, roughly six to eight, is by a wide margin your best chance of a clear cone, with a second smaller window sometimes around sunset. If you have three nights, you will probably get one good view. Plan your photograph accordingly and do not spend the trip waiting.
Recommended Tours and Experiences
The Arenal Packing List
Base and travel layers
One lightweight merino top earns its place in the tropics for the reason that applies in every humid destination: odour. In this climate a synthetic top is finished after a day and cotton is worse, while merino stays wearable across several wears, which matters on a route that keeps moving between Arenal, Monteverde and the coast. It also handles the one genuinely cool situation here, which is an early morning boat across Lake Arenal or an air conditioned shuttle.
Beyond that, three or four quick drying tops, two pairs of light trousers or shorts, swimwear and a change of it, since you will be in water most days.
Footwear
Two pairs, because one will be wet. A pair of waterproof hiking shoes handles the national park lava trails, the hanging bridges and the waterfall steps, all of which are slick when wet, which is most of the time. Add water shoes for the hot springs, the river and the pool at the base of the waterfall, where the rocks are rounded, slippery and sharp in equal measure. Leave flip flops as the only option; they are the reason a lot of people fall on the waterfall staircase.
Sun, rain and insects
Cloud cover here is deceptive and you are at 10 degrees north, so a wide brim sun hat and sunscreen still matter, particularly on the lake and on open lava fields. Mosquitoes are present year round and dengue occurs in Costa Rica, so pack a DEET insect repellent and apply it during the day as well as at dusk, since the dengue mosquito bites in daylight.
Practical kit
Rehydration salts, since you will sweat more than you notice in humidity. A refillable bottle: Costa Rican tap water is safe to drink in La Fortuna and most of the country. A power bank, since you will be out all day. Cash in colones for small purchases, though US dollars are widely accepted and cards work in most places.
What to Wear at Key Sites
La Fortuna waterfall
The waterfall drops around 70 metres into a pool in a green bowl, and reaching it means roughly 500 steps down and, more to the point, 500 steps back up in heat and humidity. It is a genuine bit of exercise rather than a stroll. Wear the walking shoes for the stairs and carry the water shoes for the pool, which is cold, fast moving at the base and roped off close to the falls for good reason. Swim at the calmer downstream end. Take the quick dry towel and expect to be wet on the climb out.
The hot springs
Geothermally heated rivers feed a range of options from full resort complexes like Tabacon and Eco Termales, which require booking, to the free public stretch of the Rio Chollin under the bridge, which is exactly what it sounds like and is used by locals and travellers alike. Bring swimwear you can change into easily, a towel, and water shoes for the free river, where the rocks are uneven. Leave jewellery behind: the mineral water tarnishes silver, and at the free spot there is nowhere secure.
Arenal Volcano National Park and the hanging bridges
The park trails cross old lava fields from the 1968 to 2010 eruptions, which are loose, sharp, black rock with no shade, so this is a hot, exposed walk despite being in a rainforest region. The Mistico hanging bridges and similar networks are a different environment, cool and shaded under canopy, with metal bridges that are slippery when wet and surprisingly high. Both want closed shoes and the rain jacket. Bring binoculars if you have them, since the bridges are the best wildlife viewing near La Fortuna.
Getting to Monteverde, and Rio Celeste
The classic onward route is the jeep, boat, jeep transfer across Lake Arenal to Monteverde, which takes around three hours and is far better than the long road around. It is an open or semi open boat on a lake that gets choppy and windy, so take the rain jacket and a layer even on a hot day, and put electronics in a dry bag. Rio Celeste in Tenorio Volcano National Park, with its startling blue river, is a long day trip from La Fortuna and one of the muddiest trails in the country: waterproof boots, and expect to be filthy.
What Not to Bring
Leave cotton and denim, which never dry here. Leave a hair dryer, which the humidity defeats. Leave an umbrella. Leave anything leather or suede, which grows mould in this climate faster than you would believe. Leave a full week of outfits, since same day laundry is cheap and everywhere in La Fortuna.
Leave the expectation of lava. Arenal has been resting since 2010, and a tour promising glowing flows is selling you something that does not exist.
Essential Resources for Women in Arenal
Emergency numbers in Costa Rica: 911 covers police, ambulance and fire across the entire country, and operators can usually find English language support.
Tourist police: Costa Rica operates a dedicated Policia Turistica with a visible presence in the main visitor areas including La Fortuna, and they handle theft reports, directions and general visitor safety. For emergencies, use 911.
US Embassy in San Jose: Calle 98 Via 104, Pavas, San Jose, telephone +506 2519 2000, at cr.usembassy.gov. San Jose is around three hours from La Fortuna by road. Enrol in the Smart Traveler Enrollment Program at step.state.gov before you travel.
Main hospital or clinic: La Fortuna has a public clinic and private medical services used to treating visitors for the usual injuries here, which are sprains, cuts and insect reactions. The nearest full hospital is in Ciudad Quesada, about an hour away, and Hospital CIMA in Escazu near San Jose is the private facility with English speaking staff most used by international visitors. Confirm your travel insurance covers adventure activities specifically, since zip lining, canyoning, rafting and horse riding are frequently excluded from standard policies and are exactly what people do here.
Official health authority: the Ministerio de Salud at ministeriodesalud.go.cr.
US State Department travel advisory for Costa Rica: current advisory level and detail. Read it directly rather than relying on this page, since levels change.
UK FCDO travel advice for Costa Rica: entry requirements, safety and health guidance, which usually carries the better detail on riptides and natural hazards.
Official tourism authority: the Instituto Costarricense de Turismo at visitcostarica.com, which also publishes the list of certified tour operators. For the national park itself, SINAC, the national system of conservation areas, publishes opening hours and entry fees at sinac.go.cr.
Solo women safety assessment: La Fortuna is one of the easiest places in Central America to travel alone as a woman. It is a small, prosperous tourism town where the entire local economy depends on visitors feeling safe, violent crime against tourists is rare, the streets are busy into the evening, and solo travellers are completely ordinary here. Costa Rican men may be forward in a verbal, flirtatious way, which most women find mild and manageable with a clear no. The realistic risks are almost entirely about activity and environment rather than crime. Adventure tourism is the main one: zip lining, canyoning, rafting and ATV tours all carry genuine injury risk, standards vary between operators, and the fix is to book operators certified by the Costa Rican tourism institute and to check that your insurance covers the activity. Water is the second: the waterfall pool has strong currents near the base, river hot springs have slippery rock, and Costa Rica's Pacific and Caribbean beaches have riptides that drown visitors every year. The third is petty theft, which in Costa Rica is overwhelmingly theft from parked rental cars and unattended bags at trailheads rather than robbery from a person, so never leave anything visible in a car. Roads around Arenal are winding, poorly lit and shared with pedestrians, so avoid driving them after dark. Shuttles between La Fortuna, Monteverde and the coast are well organised, widely used by solo travellers and the easy way to move around.
Reading On
Arenal is almost always the first or second stop on a Costa Rican loop. The Costa Rica travel guide for women is the parent for the whole country and covers the regions, the seasons and the practical setup in more detail, and the Costa Rica packing list for women covers a full country trip rather than this one area. The travel packing guide for women is the parent for all destinations. For why a merino top still belongs in a bag bound for rainforest, the best merino wool base layers for women explains the fibre, and the Roman Trail collection is where the tops themselves live.
If the outer journey is calling you, the inner one usually is too. Explore SoulMap at romantrail.com/blogs/soulmap.
