Wildfire & Drought Risk in Vineyards

Wildfire in France has become a pressing operational variable for vineyards in  European wine regions. In July 2026, wildfires in Bordeaux underscored the pressure on France’s largest wine region, where growers are contending with severe drought, repeated heatwaves, and one of the earliest harvests on record (1). 

Growers said the fires posed no immediate threat to Bordeaux's vineyards. In Margaux, the vines remained intact, and the director general of Château Palmer did not expect the fires to affect wine quality there. Nearly two months of drought and repeated heatwaves had nonetheless intensified stress on vines, and many châteaux did not have enough water to irrigate their entire vineyard (1).

For wine producers, the operational question is how early climate stress can be detected  and acted upon. Remote sensing, combined with in-field sensors, can reveal changes in  canopy condition and soil moisture that inform irrigation decisions. Assessing wildfire  exposure also requires local fire-danger information and on-site planning. 

What Is Wildfire and Drought Risk in Vineyard Management? 

Wildfire and drought risk describes the combined exposure of a vineyard to fire events  and prolonged water scarcity. 

These two pressures are linked. Extended drought dries soil, vegetation, and surrounding  woodland, which increases vine stress and raises the likelihood of fire spreading near  vineyard blocks, most often from adjacent woodland and scrub. 

In practical terms, vineyard managers assess this risk across several dimensions: 

• Water availability in the soil and the reserves accessible to vine roots

• Vegetation dryness in and around the estate 

• Proximity to fire-prone woodland or scrub 

• Smoke exposure between veraison and harvest, the period of highest susceptibility to smoke taint (2) 

Understanding these variables allows producers to prioritize which blocks require  intervention first. 

Why Are Vineyards Increasingly Vulnerable to Wildfire and  Drought? 

Longer dry spells and repeated heatwaves reduce the moisture stored in soil and leave  surrounding vegetation dry. Several factors compound the exposure:

• Young vines, whose roots are not yet deep enough to reach underground moisture,  are among the first to suffer during drought in the Bordeaux conditions reported in  2026 (1). 

• Limited water access constrains irrigation. Many châteaux in Bordeaux do not have  enough water to irrigate their entire vineyard, so available water must be allocated to  the blocks under the greatest stress where irrigation is permitted (1). 

• Smoke from nearby fires can taint grapes. Grapes are most sensitive to the uptake of  smoke-derived volatile phenols between veraison and harvest, and the exposure can  carry into the wine (2). 

• Earlier harvests compress the window in which producers can respond. The result is a narrower margin for error, where late detection of stress can reduce yield or  quality. 

How Does Remote Sensing Detect Early Warning Signs in  Vineyards? 

Remote sensing applies satellite and aerial imagery to observe changes in canopy  conditions that are difficult to observe by eye. In-field sensors complement it by measuring  soil conditions directly. Together, they give producers frequent observations across the  estate instead of periodic field walks. 

Resolution sets the limits of the satellite layer. Sentinel-2 imagery is acquired at 10 to 20 m  resolution with a revisit period of about five days. A peer-reviewed assessment found that  this resolution limits within-block analysis, particularly for small blocks or those with complex  borders (3). Satellite signals are therefore read as block-level trends, then confirmed with in field measurements. 

Monitoring Soil and Canopy Moisture Levels 

Soil moisture is measured directly by in-field probes at defined depths. Satellite-derived  indices do not measure root-zone water. They show how the canopy responds over time, for  example through changes in leaf area and vigor, which provides an indication for vine water  status. 

When soil moisture drops below a threshold calibrated to soil type, rootstock, and growth  stage, managers can direct limited irrigation to the blocks that need it most rather than  applying water uniformly. 

Tracking Vegetation Stress with Satellite Imagery 

Vegetation indices derived from multispectral imagery track canopy vigor and chlorophyll related signal. Under water deficit, vines close their stomata to limit water loss, and  sustained deficit later reduces leaf area and greenness. Indices register these canopy  changes, and in some conditions before symptoms are visible. Lead time varies with the  index, the variety, and canopy density. 

These observations can prompt producers to verify conditions in the field and intervene while  options remain open.

Assessing Fire-Prone Areas Around Vineyards 

Fuel moisture and dryness mapping across an estate and its surroundings indicates where  vegetation has become most flammable. By combining vegetation dryness data with terrain  and wind exposure, managers can identify higher-risk zones, prioritize firebreak maintenance, and coordinate with local authorities before a fire starts. 

Public fire-danger information, local weather conditions, vegetation around the estate, and  on-site assessments can help managers review fire exposure and plan preventive measures  with the relevant authorities. It should be noted that vineyard soil sensors and canopy  indices are not, by themselves, a fire-warning system (4). 

What Are the Economic Risks of Wildfire and Drought for Wine  Producers? 

The financial exposure extends well beyond a single damaged harvest. Wildfire and drought  affect volume, quality, and long-term asset value. 

Key economic risks include: 

• Reduced yields when heat and water scarcity limit grape development

• Quality downgrades, including potential smoke taint during ripening 

• Higher operating costs from emergency irrigation, labor, and fire mitigation

• Long-term damage to vine health and estate infrastructure 

For producers already facing falling consumption, weaker export demand, and oversupply,  these risks compound existing strain on margins (1). 

Frequently Asked Questions About Wildfire and Drought Risk in  Vineyards 

How do wildfires in Bordeaux affect vineyards?

Wildfire in Bordeaux put vineyards under three pressures. Direct fire damage is possible near the pine forests around some appellations, but it has been limited: the 2022 fires did not reach the vines. Smoke is the less visible risk. The berries take up smoke compounds, grapes are most sensitive from about seven days after veraison, and the effect can carry into the finished wine (2) (5). Drought adds a separate stress, because water deficit slows ripening, and irrigation is prohibited by default in Bordeaux appellations and allowed only by special permission. 

Can remote sensing predict wildfire risk before it happens? 

Remote sensing does not predict ignition itself. It identifies the conditions that make fire  more likely, when combined with weather and fuel information. By mapping vegetation  dryness and moisture deficits, it flags higher-risk zones so that producers and authorities can  utilize the measures. Producers should use local fire-danger guidance and on-site  assessments for preventive planning (4). 

How does drought stress affect grape quality and yield? 

Severe drought stress limits the water available for berry development, which can reduce  berry size and overall yield. Sustained severe stress can also slow sugar accumulation and  alter acid balance, affecting the final quality of the wine. 

Moderate, managed water deficit is a recognized practice in some vineyards and differs from  severe stress. The objective is to keep stress within a target range, not to eliminate it. Early  detection allows producers to direct limited water where it delivers the most value. 

Which satellite data are suited to vineyard monitoring? 

Vineyard monitoring typically relies on multispectral satellite imagery, such as Copernicus  Sentinel-2, from which vegetation indices are derived, combined with soil moisture 

measurements from in-field sensors. Satellite coverage provides estate-wide trends at 10 to  20 m resolution. In-field stations provide direct, point-based soil measurements at their  installation points . A combined approach addresses the limits of each source. 

Building Vineyard Resilience with Doktar’s Monitoring  Infrastructure 

Wildfire and drought risk is a recurring operational factor for vineyards in regions facing  heatwaves and prolonged drought, as the 2026 season near Bordeaux showed. Managing it  depends on early, measurable insight into soil moisture, canopy condition, and  separately assessed fire exposure, so that limited water and resources reach the blocks  that need them first. 

Effective risk management combines: 

• Continuous soil and climate monitoring at representative points in representative  locations  

• Threshold-based alerts that flag declining soil moisture before stress becomes visible  in the canopy 

• Targeted irrigation guided by measured soil moisture and crop water demand where  irrigation is permitted 

• Records of field conditions and management decisions 

Doktar enables this shift by turning field conditions into actionable insights. Doktar’s  FieldStation is an agricultural sensor station that measures soil moisture and soil temperature with in-soil sensors, together with  air temperature and relative humidity, and delivers readings and low soil moisture alerts to  the Doktar App. These measurements underpin early warning of declining soil moisture and  targeted irrigation decisions. 

Contact Doktar to discuss how soil and climate monitoring can support vineyard water management decisions within your drought and wildfire preparedness plan. 

Reference(s): 

1. FRANCE 24 & Reuters. (2026, July 28). Bad news for Bordeaux: France's celebrated  wine industry faces wake-up call over wildfires. FRANCE 24. https://www.france24.com/en/france/20260728-bad-news-for-bordeaux-france-s celebrated-wine-industry-faces-wake-up-call-over-wildfires 

2. Krstic, M. P., Johnson, D. L., & Herderich, M. J. (2015). Review of smoke taint in  wine: Smoke-derived volatile phenols and their glycosidic metabolites in grapes and  vines as biomarkers for smoke exposure and their role in the sensory perception of  smoke taint. Australian Journal of Grape and Wine Research, 21(S1), 537-553.  https://doi.org/10.1111/ajgw.12183 

3. Devaux, N., Crestey, T., Leroux, C., & Tisseyre, B. (2019). Potential of Sentinel-2  satellite images to monitor vine fields grown at a territorial scale. OENO One, 53(1).  https://doi.org/10.20870/oeno-one.2019.53.1.2293 

4. Di Giuseppe, F. (2023). ECMWF pioneers the use of remote observations in fire  forecasting. European Centre for Medium-Range Weather Forecasts. https://www.ecmwf.int/en/newsletter/175/news/ecmwf-pioneers-use-remote observations-fire-forecasting

5. Kennison, K. R., Wilkinson, K. L., Pollnitz, A. P., Williams, H. G., & Gibberd, M. R. (2009). Effect of timing and duration of grapevine exposure to smoke on the composition and sensory properties of wine. Australian Journal of Grape and Wine Research, 15(3), 228–237. https://doi.org/10.1111/j.1755-0238.2009.0005