Did the trail to Snow Lake following the standard trail (shared with Snow Lake). The road from I-90 is fine, with maybe just a tiny bit of slush. Quite a few cars parked at the Alpental lot, but with no skiing yet, there was plenty of room. The USFS restroom was open, but in pretty dire condition and with no TP. Alpental was closed so the WSDOT public restroom at the pass might be your best bet.
Was a pretty day with dramatic shifts between sun, fog and even a little snow. Highs in the mid-30s, but as usual, once we got moving it felt pretty warm.
Snow cover is quite light for this time of year. At the start, the trail is only intermittently covered. By the end, there was maybe a foot on the ground, but the path was well packed down with only a few icy spots. We did very well in snow boots with microspikes, but most people seemed to be getting along fine with hiking boots or even sneakers.
After we veered off the Snow Lake trailhead to get to Source Lake, the footing was a little trickier (probably due to less traffic and the slope along the cliff wall), but still not a big deal. Above the lake, the trail kind of splits into a couple of mini-trails, but we gave up where we had a good view of the lake.
Nike easy hike for this time of year - there may be avalanche danger later, but right now the snow cover was low enough that it was not an issue.