Grindstone Lake is a lake in Pine County, Minnesota at about 332 m (1,089 ft) above sea level. The nearest town is Sandstone, about 10.8 km (6.7 mi) away (Grindstone Lake lies W of town).
Grindstone Lake is a large freshwater lake located in Dell Grove Township, Pine County, in east-central Minnesota approximately 6.5 miles (10.5 km) west of Sandstone, Minnesota. The lake is roughly oval shaped being approximately 2 miles (3.2 km) in length north to south and 0.5 miles (0.80 km) east to west, and a maximum depth of 153 feet (47 m). The lake has several small streams that drain the area wetlands and is considered the headwater for the Grindstone River. The lake's name is a translation from the Ojibwe zhiigwanaabikokaa-zaaga'igan (Lake abundant with grind stones). Sandstone taken from near the lake was used to make sharpening stones. The lake, North Fork Grindstone River and the lower course of the Grindstone River are depicted on the 1757 Mitchell Map. Grindstone Lake is a popular resort area drawing cabin owners and visitors from the Minneapolis-St. Paul metropolitan...From the Wikipedia article “Grindstone Lake (Minnesota)”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Grindstone Lake the sunrise point swings a long way through the year: about 54° (NE) at the June solstice and 124° (SE) in late December. Sunset moves from 306° (NW) in June to 236° (SW) in December, and the midday sun climbs to 67° in summer but only 20° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:16 AM | 90° E | 7:25 PM | 271° W | 44° | 12h 09m |
| June solstice (Jun 21) | 5:21 AM | 54° NE | 9:08 PM | 306° NW | 67° | 15h 46m |
| September equinox (Sep 22) | 7:00 AM | 89° E | 7:12 PM | 271° W | 44° | 12h 12m |
| December solstice (Dec 21) | 7:52 AM | 124° SE | 4:30 PM | 236° SW | 20° | 8h 37m |
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
Lakes reflect best in calm air — usually the first hour after sunrise, before breezes ripple the surface.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 7:18 AM | 7:51 AM | 8:39 AM | 4:05 PM | 4:53 PM | 5:27 PM | 9h 02m |
| February | 6:45 AM | 7:16 AM | 7:58 AM | 4:56 PM | 5:38 PM | 6:09 PM | 10h 22m |
| March | 6:56 AM | 7:26 AM | 8:05 AM | 6:38 PM | 7:18 PM | 7:48 PM | 11h 52m |
| April | 5:55 AM | 6:26 AM | 7:07 AM | 7:19 PM | 7:59 PM | 8:30 PM | 13h 33m |
| May | 5:05 AM | 5:40 AM | 6:24 AM | 7:55 PM | 8:38 PM | 9:13 PM | 14h 58m |
| June | 4:42 AM | 5:21 AM | 6:07 AM | 8:19 PM | 9:06 PM | 9:44 PM | 15h 45m |
| July | 4:59 AM | 5:36 AM | 6:21 AM | 8:16 PM | 9:01 PM | 9:38 PM | 15h 25m |
| August | 5:39 AM | 6:12 AM | 6:54 AM | 7:41 PM | 8:23 PM | 8:56 PM | 14h 11m |
| September | 6:21 AM | 6:51 AM | 7:30 AM | 6:46 PM | 7:25 PM | 7:56 PM | 12h 35m |
| October | 6:59 AM | 7:30 AM | 8:10 AM | 5:46 PM | 6:27 PM | 6:58 PM | 10h 58m |
| November | 6:41 AM | 7:14 AM | 7:59 AM | 3:56 PM | 4:41 PM | 5:14 PM | 9h 28m |
| December | 7:14 AM | 7:49 AM | 8:39 AM | 3:37 PM | 4:28 PM | 5:02 PM | 8h 39m |
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 Grindstone Lake, the Milky Way core is visible in a dark sky from April through August. June gives the longest window (about 2.8 hours on a moonless night), and the core peaks around 15° above the southern horizon. Our light-pollution model puts the sky at about Bortle 3 (rural sky), good enough for detailed Milky Way images.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -5° | — |
| February | Below 10° in darkness | — | 6° | — |
| March | 5:28 AM – 5:38 AM | 0.2 | 11° | SSE → SSE |
| April | 3:19 AM – 4:29 AM | 1.2 | 14° | SSE → SSE |
| May | 1:21 AM – 3:21 AM | 2.0 | 15° | SSE → S |
| June | 11:47 PM – 2:37 AM | 2.8 | 15° | SSE → SSW |
| July | 11:28 PM – 1:18 AM | 1.8 | 15° | S → SSW |
| August | 10:21 PM – 11:21 PM | 1.0 | 14° | SSW → SSW |
| September | 9:08 PM – 9:18 PM | 0.2 | 11° | SSW → SSW |
| October | Below 10° in darkness | — | 6° | — |
| November | Below 10° in darkness | — | -3° | — |
| December | Below 10° in darkness | — | -20° | — |
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: 3 Bortle 3 — Rural sky. Some light domes sit on the horizon, but the Milky Way still looks complex overhead. Modeled zenith brightness ≈ 21.65 mag/arcsec². Aurora needs roughly Kp 4.0+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show July as the clearest month (about 51% average cloud cover) and December as the cloudiest (71%). 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 | 43 | 54 | 75 | 83 | 87 | 92 | 103 | 96 | 93 | 81 | 66 | 43 |
| Low °F | -43 | -32 | -32 | 4 | 24 | 38 | 45 | 42 | 30 | 6 | -9 | -31 |
| Precip. (in) | 0.6 | 0.8 | 1.3 | 2.5 | 3.4 | 4.3 | 3.8 | 3.2 | 3.1 | 2.9 | 1.2 | 1.1 |
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 lake
- For mirror reflections, get low and close to the water; the reflection grows with a lower camera.
- A polarizer can remove reflections to show the lakebed — or keep them, depending on rotation.
- Mist often lifts off lakes on cold mornings after warm days, especially in autumn.
- Include shoreline rocks, reeds or a log as foreground to give the reflection depth.
- Shoot RAW to keep the most latitude for high-contrast sunrise and sunset scenes.
Season: Autumn mornings bring mist and fall color; high-elevation lakes are usually ice-free only from early summer to mid-autumn.
Suggested gear: Tripod, Circular polarizer, Wide-angle lens, Waterproof boots. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Grindstone Lake, closest first.
WaterfallWaterfall
State Park
National Wildlife Refuge
Fire LookoutFAQ
When is the best time to photograph Grindstone Lake?
What time is golden hour at Grindstone Lake?
Where does the sun rise and set at Grindstone Lake?
Can you see the Milky Way from Grindstone Lake?
Do you need a permit to photograph at Grindstone Lake?
How far is Grindstone Lake from Sandstone?
Sources
Location data: Wikidata, USGS GNIS / GeoNames, 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.