January
January visitability 51, crowd 16, value 54.
Best Time to Visit
Best Time to Visit Alcatraz Island
Best primary window for Alcatraz Island: April, with May and October as strong shoulder months.
October 27, 2026Data snapshot
4Source cards
This page lists month windows for Alcatraz Island from the checked-in NPS snapshot and the dated source cards on the page.
Answer Brief
Answer-first planning signal
- Best current use
- Alcatraz Island is listed as an Island in the checked-in NPS identity snapshot.
- Best months
- April, May, October
- Peak crowd months
- July, August, June
- Current signal
- Alcatraz Island is listed as an Island in CA in the checked-in NPS identity snapshot. 4 source cards on this page. Data snapshot: October 27, 2026. Official NPS page: https://www.nps.gov/alca/index.htm.
- Visitor takeaway
- Month windows for Alcatraz Island are listed on this page. Official NPS page: https://www.nps.gov/alca/index.htm.
- What it sounds like
- Alcatraz Island audio on this page is a labeled modeled cue, not a field recording.
Seasonality
Best Windows
Month windows listed on this page: primary April, May; lower-crowd October, April; peak July, August.
- Primary window
- April, May
- Best value
- October, April
- Peak pressure
- July, August
Monthly Curve
Month-by-Month Snapshot
Each month lists visitability, crowd, and value figures from this page's month table.
February
February visitability 54, crowd 18, value 56.
March
March visitability 58, crowd 28, value 59.
April
April visitability 62, crowd 42, value 61.
May
May visitability 62, crowd 60, value 60.
June
June visitability 58, crowd 82, value 54.
July
July visitability 52, crowd 94, value 48.
August
August visitability 52, crowd 92, value 47.
September
September visitability 61, crowd 70, value 58.
October
October visitability 62, crowd 44, value 62.
November
November visitability 57, crowd 24, value 59.
December
December visitability 52, crowd 16, value 55.
Pressure
Reservation Pressure
Reservation-pressure figures on this page are listed by month.
- July
- 83
- August
- 82
- June
- 73
- September
- 63
Modeled Audio
Hear a modeled cue for Alcatraz Island
A browser-generated composition for orientation, not a field recording or live condition.
How NPS Sounds modeled audio works
Modeled cue ready.
Alcatraz Island visit guideMethodology
Methodology
Alcatraz Island source cards come from the data snapshot October 27, 2026. This page lists the NPS identity snapshot and the month table below.
- Data snapshot
- October 27, 2026
- Source cards
- 4
- Version
- checked-in NPS snapshot
- Input
- checked-in taxonomy snapshot
- Input
- month windows listed on this page
Read the NPS Sounds methodology and about NPS Sounds for how month windows are assembled.
Data Behind This Reading
Source provenance
NPS identity
highAlcatraz Island is identified as Island with NPS code alca.
SourceOfficial operations
limitedOfficial alerts should be verified on the NPS page. This site uses a checked-in snapshot, not a live operations feed.
SourceWeather and seasonality
limitedThe climate on Alcatraz is unpredictable and can change suddenly. Cold, foggy mornings may give way to sunny afternoons, which in turn can shift quickly back to more fog and blustery winds. The most pleasant weather usually occurs in spring and fall. Summers tend to be cool and foggy, winter is our rainy season. Temperatures on Alcatraz seldom rise above 75°F (24°C) or fall below 38°
SourceHow this page is assembled
limitedbest_time page source cards come from the data snapshot October 27, 2026.
SourceAlternatives
Cross-Park Alternatives
Other NPS places in the same state or region.
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Cabrillo
Best primary window for Cabrillo: April, with May and October as strong shoulder months.
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Best primary window for California: April, with May and October as strong shoulder months.
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Castle Mountains
Best primary window for Castle Mountains: February, with March and April as strong shoulder months.
National Monument
César E. Chávez
Best primary window for César E. Chávez: April, with May and October as strong shoulder months.