Is walking okay for spinal stenosis patients?

OK - but not enough: Walking is ok - (better than sitting around). Walking however does not really increase back muscle strength (no challenge to the muscles, you are not going to get a bigger biceps from walking either). To significantly strengthen the para-spinous muscles (thereby reducing strain on the spinal column), isometric exercises e.g. Swimming, bicycle, rowing machine, yoga) are preferred to just walking.

Walking OK: Walking is an excellent exercise and is encouraged. Unfortunately, patients with lumbar spinal stenosis may experience pain radiating down the buttocks, into the hips and thighs and possibly to the lower legs. This is called neurogenic claudication and may respond to decompressive lumbar laminectomy.

Yes: For spinal stenosis patients, walking is ok but maybe more difficult. Neurogenic claudication (buttock and leg pain/weakness) from spinal stenosis is often positional. Symptoms are typically worse when standing because the spine is extended, resulting in slightly more stenosis. Exercises where the spine is flexed, such as biking, typically lessen symptoms and may be more comfortable.

Yes: Yes, it is ok to walk and try to stay as active as possible. That being said, walking does tend to aggravate the symptoms of spinal stenosis to variable degrees.