Updated October 2026
Best Time to Visit San Juan Island National Historical Park
National Historical ParkWashington
Best month to visit
October
59°F / 44°F avg high / low
Our recommendation
Visit San Juan Island in October
October offers the lightest crowds of the park's good-weather months. For comparison, July is the most crowded month (~1.8× the average month) and January is the quietest.
- Annual visits
- 421K
- 2025
- Busiest month
- Jul
- 1.8× avg
- Quietest month
- Jan
- 0.5× avg
- 10-yr trend
- rising
- +68.5%
How crowded is San Juan Island by month?
Relative crowd level by month (1.0 = the park's average month), from NPS visitation records 1979–2025.
Month-by-month crowd, weather & daylight
San Juan Island National Historical Park weather by month →
| Month | Crowd level | Best-time score | Avg high / low | Daylight |
|---|---|---|---|---|
| January | Very quiet | 53 Fair | 47°F / 37°F | 8.5 h |
| February | Very quiet | 57 Fair | 49°F / 37°F | 9.9 h |
| March | Quiet | 57 Fair | 53°F / 38°F | 11.6 h |
| April | Quiet | 61 Good | 57°F / 41°F | 13.4 h |
| May | Average | 61 Good | 64°F / 44°F | 15.0 h |
| June | Busy | 55 Fair | 68°F / 48°F | 15.9 h |
| July | Very busy | 51 Fair | 72°F / 50°F | 15.5 h |
| August | Very busy | 53 Fair | 73°F / 50°F | 14.1 h |
| September | Busy | 54 Fair | 68°F / 48°F | 12.3 h |
| Octoberour pick | Quiet | 59 Fair | 59°F / 44°F | 10.5 h |
| November | Quiet | 54 Fair | 51°F / 40°F | 8.9 h |
| December | Quiet | 48 Fair | 46°F / 37°F | 8.1 h |
Climate normals (1991–2020) from the nearest NOAA station (USW00094276, ~1.7 mi away).
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About visiting San Juan Island
San Juan Island National Historical Park is a National Historical Park in WA and a moderately visited park, drawing about 421,000 recreation visits in 2025. Visitation has climbed over the past decade, up roughly 68.5%, so crowds are trending heavier each year. Crowds concentrate sharply by season: July is the busiest month at about 1.8× the park's average month, while January is the calmest at roughly 0.5× — a 4-to-1 swing between high and low season. Roughly 42% of the year's visitors arrive in the three summer months of June, July and August alone, so timing a trip outside that window is the single biggest lever on how crowded the park feels. Weather swings from an average high-season warmth near 62°F in August down to about 42°F in December, with the wettest stretch in November. About 6 months a year see comfortable average temperatures in the 50–80°F range, which is part of why crowd timing and weather timing don't always line up. The sweet spot is October: the lightest crowds of the park's good-weather months. Visit then and you trade a little peak-season certainty for noticeably shorter lines and easier parking than the July rush. Daylight ranges from about 8.1 hours in midwinter to 15.9 hours near the summer solstice, which shapes how much ground you can cover in a day. These crowd figures are drawn from 1979–2025 of National Park Service visitor-use records, paired with 1991–2020 NOAA climate normals, and are updated as new monthly data is released.
Park overview
San Juan Island is well known for its splendid vistas, saltwater shores, quiet woodlands, orca whales and one of the last remaining native prairies in the Puget Sound/Northern Straits region. But it was also here in 1859 that the United States and Great Britain nearly went to war over possession of the island, the crisis ignited by the death of a pig.
Weather & conditions
Spring: Temperatures usually range from 40 F to 60 F. Wildflowers are at their peak around May. Summer: Temperatures usually range from 45 F to 70 F. On very sunny days, be prepared with water-heat exhaustion is a common complaint among park visitors who are unprepared. Fall: Temperatures usually range from 40 F to 65 F. Rain is common. Winter: Temperatures range from 35 F to 50 F. Be prepared with cold and wet weather gear and numerous layers if you intend to be outside. Rain and wind are common.
Park overview text courtesy of the National Park Service — official park site.
Where to stay near San Juan Island
Hotels, cabins, lodges and vacation rentals near San Juan Island National Historical Park — live availability and prices to plan your trip. October is our pick for the best balance of light crowds and good weather. Full lodging guide: when to book, gateway vs in-park, and the crowd calendar that drives room rates.
Top-rated places to stay near San Juan Island
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
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Getting there — nearest airports
Updated October 2026The closest airport to San Juan Island National Historical Park is Friday Harbor Airport (FRD), about 4 mi (14 min drive) away. For the most flight options, most visitors fly into Bellingham International Airport (BLI), about 2 hr 32 min away.
| Airport | Distance | Drive time | Airlines |
|---|---|---|---|
| Friday Harbor Airport (FRD)Closest | 4 mi | 14 min | Kenmore Air |
| Bellingham International Airport (BLI)Best for flights | 72 mi | 2 hr 32 min | Alaska Airlines, Allegiant Air |
| Seattle-Tacoma International Airport (SEA) | 118 mi | 3 hr 31 min | Air Canada, Air France, Alaska Airlines, All Nippon Airways, American Airlines, Asiana Airlines |
| Portland International Airport (PDX) | 277 mi | 6 hr 34 min | Air Canada, Alaska Airlines, American Airlines, Copa Airlines, Delta, Frontier Airlines |
| Tri-Cities Airport (PSC) | 324 mi | 7 hr 16 min | Alaska Airlines, Allegiant Air, Delta, Silk Avia, United Airlines |
Which airport should you choose?
- Shortest drive: Friday Harbor Airport (FRD) — about 14 min from the park.
- Most flights / best value: Bellingham International Airport (BLI) — the largest hub near San Juan Island, about 2 hr 32 min away.
What takes a reservation at San Juan Island
From National Park Service records read on October 11, 2026. Timed-entry and permit rules change from season to season; the official San Juan Island page has this year's.
Activities the park marks as needing a reservation
Frequently Asked Questions
October offers the lightest crowds of the park's good-weather months at San Juan Island National Historical Park. The park is busiest in July (about 1.8× the average month) and quietest in January.
July is the busiest month at San Juan Island National Historical Park, running roughly 1.8 times the park's average monthly visitation.
January is the quietest month at San Juan Island National Historical Park, at about 0.5× the average month — a good choice if you want to avoid crowds.
San Juan Island National Historical Park recorded about 420,922 recreation visits in 2025. Visitation has been rising over the past decade (+68.5%).
Based on 1991–2020 climate normals, the warmest month at San Juan Island National Historical Park averages about 62°F (August). See the month-by-month table above for the full picture.
Friday Harbor Airport (FRD) is the closest airport to San Juan Island National Historical Park, about 4 mi (14 min drive) away.
Bellingham International Airport (BLI) is the nearest major airport, about 72 mi (2 hr 32 min drive) away, with the most flight options of any airport near San Juan Island.
There is no airport inside San Juan Island National Historical Park. Fly into Bellingham International Airport (BLI) and drive the rest of the way — about 2 hr 32 min.
Nearby parks to visit
Keep exploring
Water quality of lakes near San Juan Island
If you are planning to swim, paddle or fish on this trip, these graded lakes are within a 40-mile drive. Grades are A–F from EPA and state-agency sampling.
- Trout Lake water qualityGrade — · 3 mi · WA
- Roche Harbor Lake water qualityGrade — · 6 mi · WA
- Hummel Lake water qualityGrade — · 8 mi · WA
- Martin Lake water qualityGrade — · 11 mi · WA
- Spencer Lake water qualityGrade — · 12 mi · WA
Beach water quality near San Juan Island
Beaches within a 40-mile drive, graded on multi-year bacteria sampling from EPA BEACON — worth checking before you plan a swim day.
- Lummi Island County, Beach 223b water qualityGrade A · 22 mi · WA
- Lummi Island County Beach Access, Beach 224 water qualityGrade A · 23 mi · WA
- Windjammer Lagoon water qualityGrade A · 24 mi · WA
- Similk Beach water qualityGrade A · 24 mi · WA
- Old Town water qualityGrade A · 25 mi · WA
Sources: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI U.S. Climate Normals 1991–2020. Crowd index = a month's visits ÷ the park's average month.