If you drag the cursor onto Harriet lake from Google Earth you'll notice from the elevation reading that the lake is not that high in elevation. Well under 2000'. Therefore snow is not an issue there. If you've had the hankering to fish Harriet then just go and fish it. Now that it is beginning to get stocked, you'll start to catch more rainbows than browns. My experience is that Harriet doesn't start getting good until the end of May and the absolute arm wrecking, frenzy trout biting time to fish it is during the first two weeks of June.