Pollen Count in Hartford, CT — Today
Updated Wednesday, October 21, 2026
The Hartford pollen count today is 7 (Low). The main driver is Ragweed, with weed pollen at 1.2 today. That total sits on a narrow base: weed pollen is 1.2 while tree pollen is just 0 and grass pollen 0.8, with mold at 1.2. Plant-by-plant detail for Hartford, CT follows, along with the outlook for the days ahead. Pollen Atlas updated this count on Wednesday, October 21, 2026.
A Low band on the Pollen Atlas index means the Total Pollen Index has stayed in the lower part of the 0–100 scale. Readings in this band are built from low individual category values rather than from one large spike, and the category split above matters more than the headline number: a low total can still contain one category, such as weed pollen or mold, reading noticeably higher than the rest, which is why the split is printed on every Hartford page.
Fall is ragweed season across most of the United States: ragweed plants release pollen from late summer into autumn, and weed pollen is typically the last major outdoor pollen category to fade as the weather cools. That pattern is why an autumn total is so often weed-led even when the headline number is low — tree and grass pollen have usually receded by then, leaving weed pollen, and on damp days mold, to make up most of what the index records. In the Northeast, autumn weed pollen typically winds down as colder nights arrive, so late-season totals can change quickly from week to week.
To see whether today’s pollen level holds, check the 5-day Hartford pollen forecast below — it is currently mixed, with Sunday the highest day in the window.
What is the pollen count in Hartford today?
The Hartford pollen count today is 7 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Total Pollen Index: 7 / 100 (Low)
Dominant allergen today: Ragweed
Pollen and mold levels
- Tree pollen: 0 (Low)
- Grass pollen: 0.8 (Low)
- Weed pollen (ragweed): 1.2 (Low)
- Mold: 1.2 (Low)
Hartford 5-Day Pollen Forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Wednesday, October 21 | 7 | Low |
| Thursday, October 22 | 11 | Low |
| Friday, October 23 | 11 | Low |
| Saturday, October 24 | 10 | Low |
| Sunday, October 25 | 13 | Low |
Pollen Atlas forecasts Hartford’s pollen count to peak on Sunday at 13 (Low) over the next 5 days.
Plants affecting Hartford now
Detailed plant-by-plant readings for Hartford were not returned in today\u2019s source data, so this section summarises the pollen types the index above is built from instead of listing individual plants.
Grass pollen is one of the categories with a non-zero reading today, at 0.8 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 1.2 (Low).
Mold is one of the categories with a non-zero reading today, at 1.2 (Low).
Tree pollen reads 0 today, so no plant from that category is named as affecting Hartford today.
In the Northeast pattern, the plants that typically shape this city’s year are spring trees, late-spring grasses and late-summer ragweed — named here as regional context only, not as today\u2019s measurements.
Plant detail returns here automatically on any day the source data includes it.
Every pollen type, with photos and seasons: the pollen directory.
How to read this index
Pollen Atlas reports Hartford on a Total Pollen Index from 0 to 100, built from separate tree, grass, weed and mold readings. The total is a summary, not an average of the four: a single strong category can lift it, and four quiet categories can hold it down even in a month when Hartford, CT pollen is usually more active. Index values are supplied by AccuWeather data via Pollen Atlas and plant detail by the Google Pollen API, and figures update through the day, so a morning and an evening visit to this page can legitimately show different numbers.
Nearby cities
From Pollen Atlas News
See how Hartford ranks against the worst pollen cities today
Pollen indexes: AccuWeather data via Pollen Atlas. Plant detail: Google Pollen API. Figures update through the day.