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AVA Trail Ratings All AVA sanctioned walk and bike events have a trail difficulty rating assigned to the route.  The rating is in two parts.  The first part is a numeric value (1-5) that describes the total cumulative amount of incline along the route.  The second part is an alphabetic value (A-E) that attempts to describes the terrain the route passes through. The rating is a subjective assignment and everyone might not agree with it.  Use it as a guide.
1	Very small hills or very little stair climbing. Probably suitable for strollers and wheelchairs. Cumulative elevation gain from Starting Point: up to 200 feet.	A	Almost entirely on pavement.
2	Some moderate hills and stair climbing. Probably suitable for strollers. May not be suitable for wheelchairs. Cumulative elevation gain from Starting Point: 200 - 1000 feet.	B	A significant part of the route is on well-groomed trails with very few obstacles.
3	Some significant hill or stair climbing. Not suitable for strollers or wheelchairs. Cumulative elevation gain from Starting Point: 1000 - 2000 feet.	C	A significant part of the route is on somewhat difficult terrain (rocky/rooted paths or soft sand.)
4	Lots of significant hills or stair climbing. Cumulative elevation gain from Starting Point: 2000 - 3500 feet.	D	A significant part of the route is on very difficult terrain.
5	Many steep hills. Cumulative elevation gain from Starting Point: more than - 3500 feet.	E	The majority of the route is on very difficult terrain.