Best time to visit Acadia.
Photo · NPS/Kristi Rugg · NPS sourceCheck before you go
- Closures, fire restrictions, construction and water: NPS Acadia current conditions
- We are independent of the National Park Service. The official pages above are the source of record for anything that changes.
Compare Acadia by month.
Three signals for each month: how busy it is against August, the average weather, and how much of the road system is normally open. Tap a month for its full Acadia guide. We don't roll these into one "best month" score, because a photographer and a family on school break want different months.
Weather · NOAA normals, Acadia NP (470 ft)
| Month | Crowds | Weather | Roads & lodging | What it means |
|---|---|---|---|---|
| January |
Lowest
2% of August · 15K avg
|
Harsh
33°F / 15°F (0°C / -9°C)
|
Partly open
Typical windows · score 40/100
|
Quiet month. Park Loop Road and Cadillac Summit Road are closed to cars, except the stretch past Sand Beach and Jordan Pond Road from Seal Harbor. Cold, short days. Volunteers groom carriage road ski tracks once snow tops six inches.Read the January guide |
| February |
Lowest
2% of August · 14K avg
|
Harsh
35°F / 18°F (2°C / -8°C)
|
Partly open
Typical windows · score 40/100
|
Quietest month of the year, and nearly as cold as January. Park Loop Road is still closed to cars except the two winter stretches. No camping anywhere in the park.Read the February guide |
| March |
Lowest
4% of August · 29K avg
|
Harsh
42°F / 25°F (5°C / -4°C)
|
Partly open
Typical windows · score 40/100
|
Still very quiet. Park Loop Road stays closed to cars until April 15, except the two winter stretches. Expect icy, snow-packed trails.Read the March guide |
| April |
Lowest
13% of August · 102K avg
|
Mixed
53°F / 35°F (12°C / 2°C)
|
Usually most open
Typical windows · score 65/100
|
Park Loop Road reopens to cars April 15 if weather permits. The carriage roads can close to all uses during spring mud season, and some cliff trails close when peregrine falcons nest.Read the April guide |
| May |
Moderate
41% of August · 327K avg
|
Good
65°F / 45°F (18°C / 7°C)
|
Usually all open
Typical windows · score 100/100
|
Visits jump to 41% of August. The unpaved roads open May 15, and in 2026 Cadillac Summit Road reservations started May 20, the day Seawall and Schoodic Woods opened.Read the May guide |
| June |
Busy
77% of August · 612K avg
|
Good
74°F / 54°F (23°C / 12°C)
|
Usually all open
Typical windows · score 100/100
|
Busy, at 77% of August's visits. Every road is open, and driving Cadillac Summit Road takes a vehicle reservation. Some cliff trails are usually closed for nesting peregrine falcons.Read the June guide |
| July |
Peak
98% of August · 786K avg
|
Good
79°F / 60°F (26°C / 16°C)
|
Usually all open
Typical windows · score 100/100
|
Peak crowds. NPS calls the Park Loop Road area extremely congested in July and August, and the Sand Beach lot can fill by 9 am. The ocean averages 55 to 60°F in summer.Read the July guide |
| August |
Peak
100% of August · 799K avg
|
Ideal
78°F / 60°F (26°C / 15°C)
|
Usually all open
Typical windows · score 100/100
|
Busiest month of the year. NPS calls Park Loop Road extremely congested, so start early. Driving Cadillac Summit Road takes a vehicle reservation.Read the August guide |
| September |
Peak
83% of August · 663K avg
|
Good
71°F / 53°F (22°C / 12°C)
|
Usually all open
Typical windows · score 100/100
|
Strong shoulder month, at 83% of August's visits. Average high 71°F, low 53°F. All four campgrounds are open, and the Cadillac reservation is still required.Read the September guide |
| October |
Busy
70% of August · 557K avg
|
Mixed
59°F / 43°F (15°C / 6°C)
|
Usually all open
Typical windows · score 100/100
|
The fall color month: Maine's foliage report gives the second week as the typical Downeast peak. The campgrounds close by October 19, and the Cadillac reservation ends October 25 in 2026.Read the October guide |
| November |
Lowest
9% of August · 73K avg
|
Rough
48°F / 33°F (9°C / 0°C)
|
Usually all open
Typical windows · score 100/100
|
Quiet, at 9% of August's visits. Park Loop Road stays open to cars until December 1 unless a significant snowfall closes it first. The unpaved roads close November 15.Read the November guide |
| December |
Lowest
2% of August · 16K avg
|
Harsh
38°F / 22°F (3°C / -5°C)
|
Partly open
Typical windows · score 40/100
|
Quiet month. From December 1, Park Loop Road and Cadillac Summit Road are closed to cars except two short stretches. Short days, and no winter camping.Read the December guide |
Open the full Acadia crowd calendar
Rain, snow, latest-year counts, and the weather station
The Acadia NP NOAA station sits at ~470 ft near park headquarters, about 2.5 miles from the NPS API coordinate, so these numbers describe inland Mount Desert Island, not the summits or the open coast. NPS says weather on Cadillac Mountain (1,530 ft) and the other peaks can be very different from Bar Harbor.
| Month | Visits in 2025 | Rain | Snow |
|---|---|---|---|
| Jan | 13,183 | 4.48″ | n/a |
| Feb | 10,352 | 3.84″ | n/a |
| Mar | 26,000 | 4.94″ | n/a |
| Apr | 95,200 | 5.15″ | n/a |
| May | 323,243 | 4.50″ | n/a |
| Jun | 631,333 | 4.28″ | n/a |
| Jul | 797,030 | 3.27″ | n/a |
| Aug | 844,268 | 3.45″ | n/a |
| Sep | 659,471 | 4.22″ | n/a |
| Oct | 599,253 | 5.86″ | n/a |
| Nov | 68,005 | 5.89″ | n/a |
| Dec | 11,980 | 5.66″ | n/a |
Acadia's September figure (83% of August's visits) is a monthly average. We don't publish weekly NPS counts on this page, so it can't show how Labor Day weekend compares with the rest of the month. Treat the September pick as a monthly-mean call.
How these scores are computed (and why there's no combined "best month")
Crowd score
Formula: 100 − (this month's visits ÷ park's peak month visits) × 100. Each park scored against its own peak, not against other parks.
Source: NPS Visitor Use Statistics Data Package 2025, Recreation Visits (TRV), 5-year monthly mean (2021-2025). Reproduce these numbers on the NPS IRMA Stats portal.
Reading it: August at Acadia reads 0 (peak). February reads 98 (quietest). A 50 means about half the park's peak crowd.
Weather score
Formula: weatherScore = round(max(0, min(100, dayComfort − precipPenalty − snowPenalty − freezePenalty))). The piecewise day-comfort function is continuous at every boundary.
- Day comfort:
tmax < 50°F →
max(10, (tmax − 20) × 2)(cold tail); 50–60°F →60 + (tmax − 50) × 4(ramp to 100); 60–78°F → 100 (plateau); 78–85°F →100 − (tmax − 78) × 5(ramp to 65); > 85°F →max(30, 65 − (tmax − 85) × 5)(hot tail). - Precip penalty:
max(0, prcpIn − 1.5) × 8; kicks in above 1.5 in / month. - Snow penalty:
snowIn × 2.5. If the selected station does not publish a snowfall normal, the score applies no snow penalty and labels snowfall as unavailable. - Night-freeze penalty:
max(0, 32 − tmin) × 1.5when tmin < 32°F.
Source: NOAA NCEI U.S. Climate Normals 1991-2020, station Acadia NP, ME (USC00170100, 470 ft).
Caveat: The Acadia NP NOAA station sits at ~470 ft near park headquarters, about 2.5 miles from the NPS API coordinate, so these numbers describe inland Mount Desert Island, not the summits or the open coast. NPS says weather on Cadillac Mountain (1,530 ft) and the other peaks can be very different from Bar Harbor.
Access score
Formula: For each named park road, count it open if its typical operating window covers that month. Score = round((sum of weights of open roads / sum of all weights) x 100). Where a park has a partial winter access mode, the profile documents that assumption in its access notes.
Route weights at Acadia:
- Park Loop Road: Open to cars Apr 15 → Dec 1
- Cadillac Summit Road: vehicle reservation: Reservation May 20 → Oct 25, 2026
- Schoodic Peninsula (mainland district): Loop road open all year
- Isle au Haut (boat-only district): Year-round ferry · Duck Harbor stop mid-June → late September
- Island Explorer bus: Typically mid-June → mid-October
- Carriage Roads (non-motorized): Year-round · seasonal closures
- Cliff trails: peregrine falcon nesting closures: Usually closed late spring → summer
- Entry, fees, and timed entry: Pass required all year · Cadillac reservation seasonal
- Lodging and campgrounds: Campgrounds May → mid-October · towns all year
Editorial methodology: the route weights are chosen by our editors from NPS road and lodge operating dates and the park's own access caveats below the score table.
Caveat: The score reflects wheeled-vehicle road access only. Backcountry, hiking, lodging, shuttle, and other service availability are not directly included unless the park profile states otherwise.
Why no combined score?
A combined "best month" number forces a weighting: how much do you care about crowds vs. weather vs. access? Those weights are personal. A photographer optimizing for golden light weights differently than a parent locked to school break weights differently than a winter visitor with a 4WD. We show the inputs and let you decide. Use the per-month grid above to navigate to a deeper page.
When are roads and lodges open?
Roads, entrances, and lodges by season. Road closures and lodge seasons decide what a month can actually offer. Verify with NPS before you travel; these change.
Last updated · Sep 11, 2026
Every road's opening and closing dates: Acadia road closures.
Park Loop Road
Park Loop Road and the park's other paved roads are open to cars April 15 to December 1, 2026, and NPS says the loop closes earlier if a significant snowfall comes first. From December 1 to April 14, only two short stretches stay open to cars: Schooner Head Road to Otter Cliff Road past Sand Beach, and Jordan Pond Road from Seal Harbor. The unpaved roads are open May 15 to November 15. Construction can close sections inside the season, so check the official NPS Acadia conditions page before driving.
Cadillac Summit Road: vehicle reservation
The road climbs to the 1,530-foot summit of Cadillac Mountain, the highest point on the U.S. eastern seaboard. Driving it takes a $6 timed-entry vehicle reservation from May 20 to October 25, 2026, on top of an entrance pass. Reservations are sold online in advance only, not at the park. Vehicles over 21 feet long, RVs, and trailers are not allowed. Check the NPS vehicle reservations page, and see our Acadia reservations page for how booking works.
Schoodic Peninsula (mainland district)
The Schoodic Peninsula is the part of Acadia on the mainland, about 60 to 70 minutes from Bar Harbor. Its 6-mile, one-way Schoodic Loop Road is listed as open all year, and vehicles longer than 21 feet are not allowed on it. Schoodic Woods Campground's 2026 season runs May 20 to October 12. Details are on the NPS Schoodic page.
Isle au Haut (boat-only district)
Isle au Haut is reached by a passenger-only ferry from Stonington, which runs all year to the Isle au Haut Town Landing. From mid-June through late September it also stops at Duck Harbor, near the campground. Duck Harbor Campground's five lean-to shelters must be reserved ahead, and its 2026 season runs June 17 to October 5. Check the NPS Isle au Haut page.
Island Explorer bus
The Island Explorer is a fare-free, propane-powered bus that stops at campgrounds, carriage road entrances, and many trailheads, and links the park with nearby towns and the Bar Harbor airport. NPS says it typically runs mid-June to mid-October and suggests riding it if you can. In 2026, per the operator, three routes started May 20 and the rest run June 23 to October 12. It does not go to the Cadillac summit. Confirm on the Island Explorer schedule.
Carriage Roads (non-motorized)
The 45 miles of carriage roads are closed to cars. They are open for walking, running, bicycling, snowshoeing, and skiing, and Class 1 e-bikes are allowed, but not Class 2 or 3. Volunteers groom ski tracks once snow is more than six inches deep and the roadbed is frozen. In spring NPS can close them to all uses during mud season. See the NPS carriage roads page.
Cliff trails: peregrine falcon nesting closures
When peregrine falcons nest, NPS temporarily closes trails near the nesting cliffs. The Precipice, East Face, and Jordan Cliffs Trails and the northern section of the Flying Mountain Trail are usually closed from late spring to summer. Check current trail closures before counting on one; background is on the NPS peregrine falcons page.
Entry, fees, and timed entry
A park entrance pass is required all year: $35 per private vehicle for seven days. Acadia is one of 11 parks where non-U.S. residents age 16+ pay a $100 nonresident fee in addition to standard admission unless covered by an annual or America the Beautiful pass. The America the Beautiful Annual Pass is $80 for U.S. residents and $250 for nonresidents. The $6 Cadillac Summit Road reservation is a separate fee. Verify terms on the NPS nonresident fees page.
Lodging and campgrounds
Acadia's own overnight options are its campgrounds, and NPS points visitors to accommodations in nearby towns. The 2026 seasons: Blackwoods May 1 to October 19, Seawall and Schoodic Woods May 20 to October 12, and Duck Harbor on Isle au Haut June 17 to October 5, all reserved in advance on Recreation.gov. There is no winter camping or overnight parking anywhere in the park. Confirm on the NPS Acadia camping page.
Which month fits your trip?
The month table answers most trips. These four decide the date for the rest, and each has its own page with the facts behind it.
Also for Acadia: Road closures and dates · Airports · Fees and passes · Accessibility.
Questions about when to go.
What is the best month to visit Acadia?
It depends on what you want. For a balance of crowds, weather, and open roads, September usually works well. If empty trails matter most, look at post-Labor Day to mid-October. For the widest range of open roads and services, aim for late May to mid-October.
When should I avoid Acadia?
August is the busiest month, when parking and lodging are tightest. If instead you want the park at its most open, the tougher month is January, when weather and seasonal closures limit how much you can reach.
What are the quietest months at Acadia?
The quietest stretch is February, January, and December. February is the low point, averaging about 13,774 recreation visits, roughly 2% of the August peak.
Which month has the best weather at Acadia?
August usually brings Acadia's most comfortable conditions, with average highs near 78°F. It is not always the quietest month, so use the month grid above to weigh weather against crowds.
How this page
is built.
Not affiliated with or endorsed
by the National Park Service.
Crowd numbers on this page are the Recreation Visits column from the NPS Visitor Use Statistics Data Package, 2025. Monthly figures are five-year arithmetic means (2021-2025) against each park's own peak month. We do not compare parks against each other for the crowd score: only against themselves.
Weather numbers are NOAA NCEI U.S. Climate Normals 1991-2020, drawn from the Acadia NP, ME station (USC00170100). The station sits at 470 ft; the elevation caveat above the weather table explains where this misreads the higher districts.
Access notes are an independent summary of NPS operating posture. We do not republish NPS pages; we link them. Conditions change; confirm road status, reservation requirements, and lodging windows on https://www.nps.gov/acad/index.htm before travel.
Full year-by-year history, records, and the events behind each year: Acadia visitation by year.
- Air quality: AirNow.gov; real-time air quality and smoke conditions.
- Park conditions: NPS Acadia current conditions, verify before you drive.
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