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Largest of Bellingham lakes, can be good for flatwater and occasional downwind paddles (safer than the Bay if the Bay is too rough, but take care with very cold water in winter). Flatwater paddling is better at the edges of the day in summer or during the off season when there is not as much motorized traffic on the lake. Invasive species stickers are required for paddling on the lake. Whatcom County Invasive Species Boat Inspections. The checking station at Lake Whatcom's Bloedel Donovan Park is closed in the winter, but you should always follow the recommended precautions to prevent invasive species spread.
Reivers Dustin: “Lake (Whatcom) is nice: fresh water, good safety, less cross-chop, waves never get mean. But I've been on the lake in big air when the waves never really got surfable. So it's a direction thing as well as wind velocity….”.
Check the direction of the waves at your take-out to get a good indication of whether they are working in the way/direction you want. On good days the waves close to Bloedel Donovan are often the biggest of a run, although the wave size at BD can change significantly in the time it takes for you to drive to the put-in and paddle the length of the lake to get back to BD.
Can get decent downwind waves when wind is blowing in longer fetch directions - from the east or southeast being some of the better setups. There is less likelihood of motorized traffic on the lake in downwinding conditions.
Video - Southerly Boat Launch to Bloedel Donovan 11/25/2021
Downwind route from Southerly Boat Launch to Bloedel Donovan Boat Ramp
(this path went between Reveille Island and the left shore)
As mentioned above, downwinding weather will typically mean few if any motorboats to watch out for unless you get a rare warmer season run. Bellingham wind season is Fall and Winter when there is far less motorboat activity than in the warmer months.
Your main concern during wind season is usually going to be water temperature. Lake Whatcom is much more friendly than Bellingham Bay wavewise in all but the wildest winds. But the lake water gets considerably colder, particularly in January and February, so you have to dress for immersion. And dress for extended immersion if you are testing limits in any fashion - tippier boat, little or no buddy support, first run on Whatcom, etc. There is no Coast Guard or rescue service on the lake. In the Winter you and your party will often be the only ones on the water. Plan carefully and watch out for each other.
If you are doing a full length of the lake from the Southerly Boat Launch and the wind is E rather than SE, it is a good idea to hug the right shore in the calm branch of the lake at the start and first work you way farther across the lake going N or NE when you hit the wind coming from your right from Blue Canyon before you turn left and start to go with the wind. That will make it much easier (and more fun) to either make the gap at Reveille Island or go right of the island. Otherwise an East wind will tend to push you hard left into shore - before you reach the island after which the lake turns more to the northwest.