Bastøy

Island Island housing Norway's historic open prison

Bastøy island south of Oslo served as a historical reformatory; today visitors come by ferry to see the former prison facilities, coastal trails and a quiet, pine-lined shoreline.

Main image

Bastøy is an island in the Oslofjord in Vestfold, Norway, known primarily as the site of the Bastøy open prison. The island has been associated with reform and rehabilitation programmes linked to the facility.

The island itself is sparsely developed compared with populated mainland areas; the principal point of interest is the prison and the overall site layout showing the low-security, community-style approach to incarceration. Observers and researchers visit to study the prison’s rehabilitative model rather than for conventional sightseeing.

The island has hosted an institutional facility since the early 20th century when it was used as a reformatory; it later became an open prison. The site is noted in criminal justice literature for its focus on work, responsibility and rehabilitation.

Located in the Oslofjord off the Vestfold coast near Horten, the island sits within fjord waters southwest of Oslo. It is reached by boat from nearby mainland points and lies within Norway’s coastal island groupings.

  • Access: Access to the island is controlled because it is an active penal institution; public visits are limited and typically organised rather than casual tourist access.

What to See #

  • Bastøy Prison: An operational open prison on the island, noted for a rehabilitative, low-security regime and for being colocated with island housing and facilities rather than high walls and cells.
Bastøy
59.3713, 10.5315

How to Get to Bastøy #

Bastøy lies in the Oslofjord and is accessed by ferry from the mainland. Ferries depart from nearby ferry terminals - check seasonal schedules, especially in summer when services are more frequent.

Tips for Visiting Bastøy #

  • Reserve ferry or tour options ahead during summer peak season - space is limited
  • Respect that the island is a former reform institution; some areas are still off-limits for privacy and conservation
  • Bring insect repellent and a windproof jacket - island exposure can be abrupt

Best Time to Visit Bastøy #

Best visited in late spring through early autumn when ferry schedules are more frequent and weather is mild.

Summer (Jun-Aug)
Jun-Aug · 15-22°C (59-72°F)
Warmer weather and full ferry services make the island accessible; expect more visitors.
Late Spring/Early Autumn (May or Sep)
May and Sep · 12-20°C (54-68°F)
Fewer tourists and pleasant weather for walking; quieter than high summer.

Weather & Climate near Bastøy #

Climate

Bastøy's climate is classified as Warm-Summer Continental - Warm-Summer Continental climate with mild summers (peaking in July) and freezing winters (coldest in February). Temperatures range from -4°C to 21°C. Moderate rainfall (786 mm/year).

Best Time to Visit
JuneJulyAugust
Temperature & Rainfall
Temperature Range
31°
Warmest Month
-23°
Coldest Month
Monthly Conditions

January

January is freezing with highs of 1°C and lows of -4°C. Moderate rainfall (59 mm) and mostly overcast skies.

35 Poor

Comfort

-1°
Feels Like Freezing
-1°C
Temperature
-4°
97%
Humidity
Very Humid

Weather

59 mm
Rainfall
4.8 m/s
Wind
Light Breeze
0.0
UV Index
Low
6.7h daylight

February

February is the coldest month with highs of 1°C and lows of -4°C. Moderate rainfall (41 mm) and mostly overcast skies.

37 Poor

Comfort

-2°
Feels Like Freezing
-2°C
Temperature
-4°
96%
Humidity
Very Humid

Weather

41 mm
Rainfall
4.6 m/s
Wind
Light Breeze
0.1
UV Index
Low
9.0h daylight

March

March is cold with highs of 4°C and lows of -2°C. Moderate rainfall (57 mm) and mostly overcast skies.

46 Poor

Comfort

Feels Like Cold
C
Temperature
-2°
90%
Humidity
Very Humid

Weather

57 mm
Rainfall
4.4 m/s
Wind
Light Breeze
0.3
UV Index
Low
11.6h daylight

April

April is cold with highs of 8°C and lows of 2°C. Moderate rainfall (44 mm) and partly cloudy skies.

54 Acceptable

Comfort

Feels Like Cold
C
Temperature
82%
Humidity
Very Humid

Weather

44 mm
Rainfall
4.2 m/s
Wind
Light Breeze
0.6
UV Index
Moderate
14.3h daylight

May

May is cool with highs of 14°C and lows of 7°C. Moderate rainfall (49 mm) and partly cloudy skies.

62 Good

Comfort

11°
Feels Like Cool
11°C
Temperature
15°
79%
Humidity
Very Humid

Weather

49 mm
Rainfall
4.2 m/s
Wind
Light Breeze
1.0
UV Index
High
16.8h daylight

June

June is cool with highs of 18°C and lows of 11°C. Moderate rainfall (59 mm) and partly cloudy skies.

70 Very Good

Comfort

15°
Feels Like Cool
15°C
Temperature
11° 18°
78%
Humidity
Very Humid

Weather

59 mm
Rainfall
4.2 m/s
Wind
Light Breeze
1.4
UV Index
High
18.2h daylight

July

July is cool with highs of 21°C and lows of 13°C. Moderate rainfall (64 mm) and mostly overcast skies.

66 Good

Comfort

17°
Feels Like Cool
17°C
Temperature
13° 21°
81%
Humidity
Very Humid

Weather

64 mm
Rainfall
4.0 m/s
Wind
Light Breeze
1.3
UV Index
High
17.5h daylight

August

August is cool with highs of 20°C and lows of 12°C. Moderate rainfall (75 mm) and mostly overcast skies.

64 Good

Comfort

16°
Feels Like Cool
16°C
Temperature
12° 20°
84%
Humidity
Very Humid

Weather

75 mm
Rainfall
4.0 m/s
Wind
Light Breeze
0.9
UV Index
Moderate
15.3h daylight

September

September is cool with highs of 15°C and lows of 9°C. Regular rainfall (86 mm) and mostly overcast skies.

54 Acceptable

Comfort

12°
Feels Like Cool
12°C
Temperature
15°
87%
Humidity
Very Humid

Weather

86 mm
Rainfall
4.6 m/s
Wind
Light Breeze
0.5
UV Index
Low
12.6h daylight

October

October is cold with highs of 10°C and lows of 5°C. The wettest month with 99 mm of rain and mostly overcast skies.

52 Acceptable

Comfort

Feels Like Cold
C
Temperature
10°
92%
Humidity
Very Humid

Weather

99 mm
Rainfall
4.6 m/s
Wind
Light Breeze
0.1
UV Index
Low
10.0h daylight

November

November is cold with highs of 5°C and lows of 1°C. Regular rainfall (90 mm) and mostly overcast skies.

42 Poor

Comfort

Feels Like Cold
C
Temperature
95%
Humidity
Very Humid

Weather

90 mm
Rainfall
4.7 m/s
Wind
Light Breeze
0.0
UV Index
Low
7.4h daylight

December

December is freezing with highs of 2°C and lows of -2°C. Moderate rainfall (63 mm) and mostly overcast skies.

34 Poor

Comfort

Feels Like Freezing
C
Temperature
-3°
97%
Humidity
Very Humid

Weather

63 mm
Rainfall
4.6 m/s
Wind
Light Breeze
0.0
UV Index
Low
5.9h daylight

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