Spring conditions are marginal — cool temperatures (3-7°C), frequent wind, and unpredictable weather make this a shoulder season at best. Crags at lower elevations can be climbable on good days: 1. Hnappavellir (Suðurland) Iceland's main sport climbing crag with 100+ bolted routes up to 8c+. Becomes accessible in late spring as conditions improve. 2. Leirvogsgíl (near Reykjavik) Compact sport climbing and bouldering area just outside Reykjavík with short, powerful bolted routes. 3. Josefsdalur (near Reykjavik) Bouldering area close to Reykjavík with large boulders and routes across all grades. Note: Always check current weather conditions before heading out. Many routes can be wet or icy in April.

Summer is the prime season for climbing in Iceland, with near-endless daylight and mild temperatures (10-15°C). This is when all crags are in condition: 1. Hnappavellir (Suðurland) Iceland's premier sport climbing crag. Over 100 routes on solid basalt, from beginner grades up to 8c+. Has a dedicated online guidebook at klifur.is. 2. Valshamar (Suðurland) Established sport climbing crag in the south with a good spread of grades. 3. Leirvogsgíl (near Reykjavik) Sport climbing and bouldering. Short approach, convenient for those based in Reykjavík. 4. Josefsdalur (near Reykjavik) Popular bouldering area with a dedicated printed guidebook. Fun routes on large boulders with good landings. 5. Akrafjall (Vesturland) Bouldering and short bolted routes near Akranes, with views over the coast. 6. Arnarklettur (Seyðisfjörður, East Iceland) Sport climbing crag with routes from 5b to 7b, a 2-minute walk from the road.

Conditions deteriorate quickly in fall — shorter days, colder temperatures (5-10°C), and increasing rain and wind. Only a few accessible crags remain viable: 1. Hnappavellir (Suðurland) Often still climbable in early September on good weather days. 2. Leirvogsgíl (near Reykjavik) Sheltered enough to climb on some fall days. 3. Josefsdalur (near Reykjavik) Bouldering remains possible in dry spells through early October.