Many days of fishing progress predictably with hot and cold stretches as fish shift through their daily cycle. This cycle changes month to month, season to season. In fact, it often changes from day to day.
The average day in the mountains depends a lot on the time of year. For example, during the summer, the best fishing is often early and late in the day with the fish taking a break during the hotter hours of midday. The bright sun overhead probably doesn't help either. In the cool of morning, both trout and the bugs they feed on are active. During the spring, the best fishing is often in the middle of the day. Additional factors can often wreak havoc on these norms, however.
Last week, on a guided fly fishing trip in the Great Smoky Mountains, we were reminded about the natural rhythm and how sensitive it often is. Our day started with mostly sunny skies. Occasional clouds did not stick around long. The bright sunlight allowed the water temperature to begin climbing. This time of year, that almost guarantees bugs. Fish moved up into the faster riffles and heads of pools as they fed on nymphs that were rapidly preparing to hatch. By around 11:00 am, some adults were beginning to hatch and fish responded enthusiastically.
About that same time, the wind started to pick up and the sky filled with clouds. Around 12:30 pm, the wind shifted rapidly and temperatures started to plummet. What had been a promising hatch dried up entirely by 1:30 pm with the last fish taken on a dry fly at about 1:15 pm. The abrupt change in water temperature made all the difference in the world. It was like flipping a switch. One minute we were casting to risers and the next our day was effectively over.
If the water temperature had kept rising, in other words, if the cold front didn't pass, the clouds in and of themselves were not an issue. In fact, some of my best spring dry fly fishing happens on lousy weather days with clouds or even rain. That said, once a cold front passes and the water temperatures start dropping, bugs usually shut down along with the fish, although not always.
That "not always" is what keeps it interesting. Blue winged olives come to mind as a bug that loves lousy weather days. Interestingly, a big cold front early in the fall can have the opposite effect, setting off a feeding frenzy.
Sometimes, the switch gets flipped but it is more like a gradually dying campfire flicker instead of a lightbulb going off. One of my best days ever fishing in the Park was in May quite a few years ago. I had hiked in a long ways, earning myself solitude and good fishing in the process. The rainbows, browns, and even a brook trout or two were greedy. By the end of the day, I had caught 70 trout, all on dry flies. By the end of the day, I was probably working a little too hard, wanting to hit that nice round number. Regardless, things just sort of slowed down. I remember getting hung up on several numbers, 65 for example was hard to get past. That said, the fishing slowed down and finally quit. Number 70 almost didn't happen, but one suicidal brook trout just couldn't help itself.
That was a strange day, not bad, just strange. It was the day I knew it was going to be good fishing. That may not seem too odd, but I also knew I was going to see a bear. Up until then, I had never seen one while fishing. It happened too. Go check out the full story via the link above.
On the very best days, it seems you can do no wrong as an angler. Those days are rare, however, and should be full savored when they do happen to come around. The rest of the time, be prepared for that switch too flip. It could go from poor fishing to excellent, or it could be the other way. Whatever happens though, don't stop learning...
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