Key takeaways
- An ice grade rates ice-climb difficulty, usually on the WI (Water Ice) scale.
- WI grades run from WI1 (low-angle) to WI7+ (steep, sustained, technical, or poorly protected).
- Grades reflect steepness, sustained difficulty, technicality, and ice quality/protection.
- Ice conditions change constantly, so grades are more variable than rock grades.
WI = Water Ice; AI = Alpine Ice; M = Mixed.
What an ice grade is
An ice grade rates the difficulty of an ice climb, most commonly using the WI (Water Ice) scale for frozen waterfalls and similar ice. It runs from WI1 up to WI7 and beyond, with related systems for alpine ice (AI) and mixed rock-and-ice (M).
What WI grades mean
- WI1–WI3 — low-angle to moderately steep ice, generally good ice and protection.
- WI4–WI5 — steep, sustained sections.
- WI6–WI7+ — very steep or vertical, sustained, technical, often thin or poorly protected; expert terrain.
The grade bundles steepness, sustained difficulty, technicality, and the quality and protection of the ice.
A climber eyeing a WI5 route knows to expect steep, sustained ice demanding endurance and solid ice-screw placements — but on arrival finds the ice thin and brittle this week, making it feel harder and more serious than the grade suggests, so they read the conditions and adjust.
Why ice grades vary
Unlike rock, ice changes constantly — the same climb can be plump and well-protected one week and thin and detached the next. So an ice grade is a guideline that shifts with conditions, and reading the actual ice on the day is as important as the number. Steep ice is climbed with ice tools and screws; adding rock makes it mixed climbing.
The bottom line
Ice grades rate how hard an ice climb is, usually via the WI (Water Ice) scale from WI1 (low-angle) to WI7+ (steep, sustained, technical, thinly protected). They bundle steepness, sustained difficulty, and seriousness — but because ice changes constantly with conditions, the grade is a guideline, and reading the ice on the day matters as much as the number.
Frequently asked questions
What is an ice grade?
An ice grade is a rating of how difficult an ice climb is. The most common system is the WI (Water Ice) scale, used for frozen waterfalls and similar ice, which runs from WI1 (easy, low-angle ice) to WI7 and beyond (very steep, sustained, technical, or thinly protected ice). Related systems include AI (Alpine Ice) and M (mixed rock-and-ice).
What do WI grades mean?
Lower WI grades (WI1–WI3) cover low-angle to moderately steep ice with good ice and protection. Higher grades (WI4–WI5) involve steep, sustained sections. WI6 and WI7 indicate very steep or vertical, sustained, technical, and often thin or poorly protected ice, demanding expert skill, endurance, and nerve. The grade bundles steepness, sustained difficulty, and seriousness.
Why are ice grades more variable than rock grades?
Because ice is a constantly changing medium. The same ice climb can be plump, plastic, and well-protected one week and thin, brittle, or detached the next, depending on temperature and conditions. So an ice grade is more of a guideline that can shift with conditions, and reading the actual ice on the day is as important as the number.
Sources
- Ice climbing grades — American Alpine Club
- Ice & mixed climbing — UIAA