Located in Stephenson County, Illinois, Don Opel Arboretum is a botanical garden. It sits roughly 4.6 km (2.9 mi) WSW of Freeport.
Don Opel Arboretum is an arboretum located on the 140-acre (0.57 km2) campus of Highland Community College, 2998 West Pearl City Road, Freeport, Illinois.From the Wikipedia article “Don Opel Arboretum”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Don Opel Arboretum the sunrise point swings a long way through the year: about 57° (ENE) at the June solstice and 122° (ESE) in late December. Sunset moves from 304° (WNW) in June to 239° (WSW) in December, and the midday sun climbs to 71° in summer but only 24° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:03 AM | 90° E | 7:11 PM | 271° W | 48° | 12h 08m |
| June solstice (Jun 21) | 5:23 AM | 57° ENE | 8:39 PM | 304° WNW | 71° | 15h 16m |
| September equinox (Sep 22) | 6:47 AM | 89° E | 6:58 PM | 271° W | 48° | 12h 11m |
| December solstice (Dec 21) | 7:25 AM | 122° ESE | 4:30 PM | 239° WSW | 24° | 9h 05m |
Azimuth is measured clockwise from true north (90° = east, 270° = west). Computed for 2026; values change by less than a degree from year to year.
Golden hour & blue hour by month
Gardens are best on bright overcast days or early mornings when dew is fresh and the wind is calm.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:55 AM | 7:26 AM | 8:09 AM | 4:08 PM | 4:52 PM | 5:23 PM | 9h 26m |
| February | 6:27 AM | 6:56 AM | 7:35 AM | 4:52 PM | 5:31 PM | 6:00 PM | 10h 35m |
| March | 6:44 AM | 7:12 AM | 7:49 AM | 6:28 PM | 7:05 PM | 7:33 PM | 11h 54m |
| April | 5:49 AM | 6:19 AM | 6:56 AM | 7:02 PM | 7:40 PM | 8:09 PM | 13h 22m |
| May | 5:06 AM | 5:38 AM | 6:19 AM | 7:33 PM | 8:13 PM | 8:46 PM | 14h 35m |
| June | 4:48 AM | 5:22 AM | 6:05 AM | 7:55 PM | 8:38 PM | 9:12 PM | 15h 15m |
| July | 5:03 AM | 5:36 AM | 6:18 AM | 7:53 PM | 8:34 PM | 9:08 PM | 14h 58m |
| August | 5:37 AM | 6:07 AM | 6:45 AM | 7:23 PM | 8:01 PM | 8:32 PM | 13h 55m |
| September | 6:11 AM | 6:39 AM | 7:16 AM | 6:33 PM | 7:10 PM | 7:38 PM | 12h 31m |
| October | 6:44 AM | 7:12 AM | 7:50 AM | 5:40 PM | 6:18 PM | 6:47 PM | 11h 06m |
| November | 6:20 AM | 6:50 AM | 7:32 AM | 3:56 PM | 4:38 PM | 5:08 PM | 9h 48m |
| December | 6:50 AM | 7:21 AM | 8:07 AM | 3:43 PM | 4:28 PM | 5:00 PM | 9h 06m |
Local time (America/Chicago), including daylight saving time. Golden hour runs from about −4° to +6° solar altitude, so the morning golden hour begins during blue hour, before sunrise.
Milky Way & night sky
From Don Opel Arboretum, the Milky Way core is visible in a dark sky from March through September. June gives the longest window (about 4.2 hours on a moonless night), and the core peaks around 19° above the southern horizon. Our light-pollution model puts the sky at about Bortle 5 (suburban sky), so expect visible sky glow; drive away from towns for better results.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -3° | — |
| February | Below 10° in darkness | — | 9° | — |
| March | 4:39 AM – 5:29 AM | 0.8 | 15° | SSE → SSE |
| April | 2:32 AM – 4:32 AM | 2.0 | 18° | SE → S |
| May | 12:41 AM – 3:31 AM | 2.8 | 19° | SSE → S |
| June | 10:51 PM – 3:01 AM | 4.2 | 19° | SSE → SSW |
| July | 10:41 PM – 1:41 AM | 3.0 | 19° | S → SSW |
| August | 9:49 PM – 11:39 PM | 1.8 | 18° | S → SSW |
| September | 8:46 PM – 9:36 PM | 0.8 | 15° | SSW → SSW |
| October | Below 10° in darkness | — | 9° | — |
| November | Below 10° in darkness | — | -1° | — |
| December | Below 10° in darkness | — | -19° | — |
Window when the galactic core is at least 10° high during astronomical darkness on the 15th of each month. Pick nights within a few days of the new moon. Plan exact nights with the Milky Way planner.
Estimated sky darkness: 5 Bortle 5 — Suburban sky. The Milky Way is weak near the horizon and washed out overhead; long exposures pick up a sky glow. Modeled zenith brightness ≈ 19.92 mag/arcsec². Aurora needs roughly Kp 5.5+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show September as the clearest month (about 47% average cloud cover) and December as the cloudiest (70%). July is the warmest month and January the coldest, which matters for gear, snow access and how long batteries last at night.
Average cloud cover (%)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 56 | 66 | 78 | 83 | 92 | 98 | 105 | 100 | 94 | 86 | 73 | 66 |
| Low °F | -41 | -20 | -16 | 13 | 27 | 39 | 45 | 44 | 33 | 18 | 2 | -24 |
| Precip. (in) | 1.4 | 1.8 | 2.3 | 3.7 | 4.2 | 5.1 | 4.1 | 4.2 | 3.7 | 3.1 | 2.3 | 2.0 |
Monthly climatology for the surrounding 1° grid cell from NASA POWER (MERRA-2). Mountain sites can be colder and cloudier than the cell average.
Photography tips for this botanical garden
- Many gardens restrict tripods or charge for photography; check the rules before you go.
- Backlit petals glow; position yourself so the sun is behind the flower.
- Seasonal exhibits (orchids, tulips, cherry blossoms) draw crowds — arrive at opening.
- Kaleidoscopic and abstract images are great for flower close-ups — try the online kaleidoscope tool.
- A macro lens or close-up filter opens a world of detail — try a shallow aperture against a soft background.
- Tell someone where you're going in remote areas and carry the ten essentials.
Season: Spring bulbs and blossoms, summer perennials and autumn color; glasshouses offer winter subjects.
Suggested gear: Macro lens, Diffuser, Small reflector. Work out exposures with the depth of field, ND filter and NPF rule calculators.
FAQ
When is the best time to photograph Don Opel Arboretum?
What time is golden hour at Don Opel Arboretum?
Where does the sun rise and set at Don Opel Arboretum?
Can you see the Milky Way from Don Opel Arboretum?
Do you need a permit to photograph at Don Opel Arboretum?
How far is Don Opel Arboretum from Freeport?
Sources
Location data: Wikidata, Wikipedia. Sun, moon and Milky Way times are computed by LWPhoto Atlas for 2026. Climate: NASA POWER. Sky darkness is a population-based estimate (Walker's law), not a measurement. See data sources & licenses.