Tree Pollen Count in Harrietta, MI

Last updated Friday, November 6, 2026

This page shows the most recent reading available for Harrietta — from Friday, November 6, 2026 (1 day ago) — not today's reading.

Pollen by type in Harrietta

What is the tree pollen count in Harrietta today?

The Harrietta tree pollen index today is 0.6 (Low) on Pollen Atlas’s modelled 0–100 scale. Low

Modelled pollen risk index — not a measured count.

Harrietta’s overall pollen count today is 9 (Low) across all types. See the full Harrietta pollen count for the overall index and every type together.

Harrietta Tree Pollen Count: 5-Day Forecast

DayOverall indexCategory
Friday, November 69Low
Saturday, November 714Low
Sunday, November 814Low
Monday, November 914Low
Tuesday, November 1013Low

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 Harrietta’s overall trend across the week. Today’s tree pollen reading is the headline above.

Species driving Harrietta’s tree pollen

Species-level counts are not part of the modelled data Pollen Atlas publishes — the modelled index is reported per pollen type, not per species — so this section gives the type summary: tree pollen reads 0.6 (Low) today. The plant-by-plant detail that is available, from the Google Pollen API, is in the next section.

Plants affecting Harrietta now — tree pollen

Detailed plant-by-plant readings for the tree pollen category were not returned in today’s source data for Harrietta. The type summary stands: tree pollen reads 0.6 (Low) today.

In the Midwest & Great Lakes pattern, the plants that typically shape this city’s year are spring trees, late-spring and summer grasses, and late-summer and autumn ragweed — 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 tree pollen level means

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

Enjoy outdoor activities.

Trees run from March into May, later near the big lakes. This month sits outside the usual tree pollen window for the Midwest & Great Lakes pattern, so today’s tree pollen reading is the modelled value outranking the calendar — this page reports the modelled reading first. The Michigan allergy season guide singles out birch and oak in a compressed late-spring stack, and ragweed as the heavy fall finish.

Harrietta allergies today

Harrietta allergies today are set by the same reading as the Harrietta pollen count today: the Total Pollen Index is 9 (Low), and the tree pollen index on this page is 0.6 (Low) of it. When people ask about Harrietta allergies, this is the number that answers them — one daily modelled index built from today’s tree, grass and weed index values for Harrietta.

Allergies in Harrietta follow the Michigan calendar set out on the full Harrietta 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 Harrietta before heading outdoors, the tree 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 Harrietta allergy forecast for the tree pollen season: it shows whether Harrietta 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.

See the full Harrietta pollen count — all types, the overall index and today’s ranking context

Harrietta grass pollen count

Harrietta ragweed pollen count

See how Harrietta ranks in today's pollen count rankings — the worst cities for allergies today

See Harrietta on the pollen map

Every pollen type, with photos and seasons: the pollen directory

Michigan allergy season guide

Tree pollen season

Find an allergist in Harrietta, MI

Pollen indexes: a modelled pollen risk index computed by Pollen Atlas from open weather, vegetation and phenology data, calibrated against CDC/NAB season data. Plant detail: Google Pollen API. Index values are modelled, not measured counts. Sources: CDC/NAB; USA-NPN; GBIF (CC BY); ESA WorldCover (CC BY 4.0).