Vintage 2015 is a year of small yields, small berries, and possibly, excellence. It’s an early year, with a couple of vineyards picked out already in August. But most winemakers have hung on, as the fruit quality still has room to move up. That is, until now.
Having tasted through almost 15 vineyards the last few days, I get the sense that most grapes feel 2-4 weeks from hitting their peak, using a regular development curve. A few days ago the ten day forecast predicted 85-92F in Napa, which is great, but all that has changed the last 48 hours and now we are entering a make-or-break week.
Today we hit 100F in Calistoga and 93F in Napa. This is now scheduled to be the coolest day of the next six. Temps are likely to hit 101-107F in the northern part of the valley and 94-101F in the southern part each of the next 5 days.
For the first time in a few years it really pays to be in the southern part of the valley. Above 95F and you start to have vines shut down and this can cause the fruit to shrivel as the vines try to protect the vine and canopy and is quite willing to let the fruit go south. So a lot of water went on vines up and down the valley today and yesterday. Some wineries might try to water every day for the next few days. I think almost all the water in winery ponds will be used by the end of the week to keep things going.
In my experience, though, this only helps vines for a couple of days and extended heat eventually wins out. In the upper half of the valley, as usual, grape flavor is further along than areas south of Oakville, so many wineries are set to pick as much as possible this coming week. The bad news is that the change in temps was not expected until the last day or two and with the three day weekend upon us, a lot of vineyard workers are already set to pick many places scheduled before we knew it was going to become an oven and it might not be easy to find enough workers to pull all the fruit people want to.
This means a lot of people who want to pick their fruit will simply have to ride this out and pick at the end of the week. Brix on the floor range from 23-25 already and you can add 2-3 brix to that number by Friday, easy.
Brix however, does not always mean… flavor. Just because the brix has spiked does not mean the grapes will taste great in the tank, it just means the grapes are dehydrating. Many people found this out the hard way in 2010. It is wholly possible to see 26-27 brix and weak flavor, but if the canopies give out, you simply have to pick as extended heat can raisin the grapes regardless of flavor. Vines don’t know we are trying to make wine!
So this is going to be a very important, and frankly, make-or-break week for Napa’s 2015 vintage. The worst heat spike I’ve experienced was 2010, where we had 3 days of 103-109F. This may or may not hit that level, but it is scheduled to last 5 days, which is longer than any such spike I have yet experienced. Not only is it hot, it is super dry.
Is this what 2003 was like? That was the hottest year in Napa, ever. This year has been less hot overall, but its heat in September and October that matters for quality. The vineyards that can make it through this week relatively unscathed might make great wines. But we won’t know what things look like until next weekend for those of us hoping to ride it out. I suspect if any rain or another heat spike is predicted after this, picking will commence 24/7.
Those with the coolest heads and good vineyard management will emerge victorious.