Grass Pollen Count in St. Helena, CA — Today

Pollen by type in St. Helena

• St. Helena tree pollen count
• St. Helena ragweed pollen count
• St. Helena pollen count

What is the grass pollen count in St. Helena today?

The St. Helena grass pollen index today is 1 (Low) on Pollen Atlas’s modelled 0–100 scale. Low

Modelled pollen risk index — not a measured count.

St. Helena’s overall pollen count today is 18 (Low) across all types. See the full St. Helena pollen count for the overall index and every type together.

St. Helena Grass Pollen Count: 5-Day Forecast

Pollen Atlas models the daily detail as an overall index: day-by-day splits by individual pollen type are not part of the modelled data, so this table shows St. Helena’s overall trend across the week. Today’s grass pollen reading is the headline above.

Species driving St. Helena’s grass pollen

The modelled data reports grass as one combined index — there is no species-by-species split for grass anywhere in the data, so this page does not invent one. Today’s modelled grass index for St. Helena is 1 (Low), and the 5-day overall trend above shows the shape of the week.

As regional context only — not as today’s readings — in the California pattern, the plants that typically shape this city’s year are winter and spring trees, late-spring grasses and late-summer weeds.

The California allergy season guide singles out planted olive and the Central Valley’s concentrated spring pollen.

Plants affecting St. Helena now — grass pollen

Detailed plant-by-plant readings for the grass pollen category were not returned in today’s source data for St. Helena. The type summary stands: grass pollen reads 1 (Low) today.

In the California pattern, the plants that typically shape this city’s year are winter and spring trees, late-spring grasses and late-summer weeds — named here as regional context only, not as today’s readings.

Plant detail returns here automatically on any day the feed includes it.

What this grass pollen level means

Low risk. Keep windows open; consider allergy meds only if sensitive.

Enjoy outdoor activities.

Grasses peak in spring in the Central Valley and run longer and milder on the coast. This month sits outside the usual grass pollen window for the California pattern, so today’s grass pollen reading is the modelled value outranking the calendar — this page reports the modelled reading first. The California allergy season guide singles out planted olive and the Central Valley’s concentrated spring pollen.

St. Helena allergies today

St. Helena allergies today are set by the same reading as the St. Helena pollen count today: the Total Pollen Index is 18 (Low), and the grass pollen index on this page is 1 (Low) of it. When people ask about St. Helena allergies, this is the number that answers them — one daily modelled index built from today’s tree, grass and weed index values for St. Helena.

Allergies in St. Helena follow the California calendar set out on the full St. Helena page — the chapters, the plants behind them, and the 5-day forecast show whether today is typical for the season or an exception to it. If you are checking allergies today in St. Helena before heading outdoors, the grass pollen split on this page is the part to read: it shows whether this pollen type is doing the work today, not just how high the total sits.

Read the five-day overall trend above as the St. Helena allergy forecast for the grass pollen season: it shows whether St. Helena allergies are set to ease or build across the week, day by day — the days to plan outdoor time around are the ones where the overall index steps down, not just today.