Massachusetts · Rock climbing · Medford

Theta Boulder

9 routes
V0- – V4
Bouldering
Jun–Oct
best months

Theta Boulder is a bouldering area in Massachusetts, about 1.2 miles from Malden Highlands. It sits among a cluster of climbing spots, with Slanted Boulder and Wright's Park each about 0.1 mile away and Woodland Road Boulder about 0.4 mile off. The area is a compact, close-together set of boulders rather than a single climb, and the routes here are all bouldering grades from V0- up to V4. The most comfortable months for a visit are late spring through early fall. Typical averages from a nearby weather station in Reading run from highs around 70°F in May to about 75°F in September, with July the warmest at about 84°F. Winter brings regular snow days, with January averaging eight. The routes at Theta Boulder range from the easiest V0- on Theta Ridge to the harder V4 on Endymion. Other boulders in the immediate area include Slanted Boulder and Wright's Park, both about 0.1 mile away. For a walk nearby, East Dam Road is about half a mile off.

  • Best time to go · Jun–Oct

    Best time to visit Theta Boulder

    Best months: June–October. Best months have typical highs of 55–85 °F, lows of 30 °F or warmer (32 °F where the station doesn't record snow), at most one snowy day and no more than 12 wet days.

    1. Jan

      38° / 19°

      12 wet · 8 snow

    2. Feb

      40° / 20°

      11 wet · 7 snow

    3. Mar

      48° / 27°

      13 wet · 6 snow

    4. Apr

      60° / 37°

      13 wet · 1 snow

    5. May

      70° / 47°

      13 wet

    6. Jun

      78° / 56°

      12 wet

    7. Jul

      84° / 63°

      11 wet

    8. Aug

      82° / 61°

      10 wet

    9. Sep

      75° / 53°

      9 wet

    10. Oct

      64° / 42°

      11 wet

    11. Nov

      53° / 32°

      11 wet · 2 snow

    12. Dec

      43° / 24°

      12 wet · 5 snow

    Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Reading, MA, 5.6 mi away at 110 ft. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Routes (9)

Keep exploring — more climbs worth the drive

Hemlock Pool at Middlesex FellsPhoto: Karlunun, CC BY-SA 4.0 (via Wikimedia Commons)

Hemlock Pool at Middlesex Fells

Next door

15 bouldering routes at Hemlock Pool in Massachusetts.

Painted BoulderPhoto: Karlunun, CC BY-SA 4.0 (via Wikimedia Commons)

Painted Boulder

~1 min drive

Painted Boulder in Massachusetts has 5 bouldering routes across 3 grades.

The CovePhoto: Karlunun, CC BY-SA 4.0 (via Wikimedia Commons)

The Cove

~1 min drive

Cove, The in Massachusetts has 8 climbing routes on 6 difficulty grades.

Crag 3Photo: Karlunun, CC BY-SA 4.0 (via Wikimedia Commons)

Crag 3

~2 min drive

Crag 3 in Massachusetts has 5 routes with 4 difficulty grades, offering top-rope and trad climbing.

Fat ManPhoto: Karlunun, CC BY-SA 4.0 (via Wikimedia Commons)

Fat Man

~2 min drive

Accessible Massachusetts climbing area with varied routes for developing climbers.

Crag 54Photo: Karlunun, CC BY-SA 4.0 (via Wikimedia Commons)

Crag 54

~2 min drive

Crag 54 in Massachusetts has 8 routes with 6 difficulty grades, offering bouldering and top-rope climbing.

CLIMB

Slanted Boulder

Next door

Slanted Boulder in Massachusetts has 19 bouldering routes across 10 grades.

CLIMB

Wright's Park

Next door

Wright's Park in Massachusetts has 4 climbing routes on bouldering pads.

CLIMB

Woodland Road Boulder

Next door

5 bouldering routes in Massachusetts spanning 4 difficulty grades.

CLIMB

Highway Cliff

Next door

Highway Cliff in Massachusetts has 6 bouldering routes across 5 difficulty grades.