USDA Hardiness Zone 3b
Frost Dates for 55750 — Hoyt Lakes, Minnesota
NOAA 1991–2020 normals from Babbitt, MN (1,481 ft), 15 miles north.
Updated
In Hoyt Lakes, the last spring frost (32°F) is around May 28 in half of years and has passed by June 16 in nine years out of ten. The first fall frost comes around September 14, as early as August 29 one year in ten, leaving a typical freeze-free season of 108 days (NOAA, Babbitt, MN).
- Last spring frost
- May 28
- First fall frost
- September 14
- Growing season
- 108 days
- Hardiness zone
- 3b
50% probability
50% probability
freeze-free, 50%
-35 to -30°F (-37.2 to -34.4°C) coldest night
- First snow
- October 28
- Last snow
- April 18
- Winters with snow
- 100%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
23 of 23 observed
NOAA normal
Frost risk by date in Hoyt Lakes
Half of springs at Babbitt, MN see their last 32°F night by May 28; only one in ten is past it by May 11, and one in ten still has one after June 16. Planting tender crops after June 2 leaves a 30% risk of a frost on them, after June 6 20%, and after June 16 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 98% of the 142 Minnesota stations behind this site's ZIP pages.
In fall the first 32°F night comes by September 14 in half of years, as early as August 29 one year in ten, and holds off past September 29 one year in ten. A hard freeze of 28°F follows 12 days later, around September 26; in spring the one-in-ten date for 28°F is May 29, 18 days before the 32°F one. The freeze-free season lasts 108 days in a typical year, shorter than at 99% of the 142 Minnesota stations; it reaches 130 days one year in ten and falls short of 86 one year in ten. On average 203 nights a year drop to 32°F or below. Severe cold of 16°F or below comes every winter, usually between November 1 and April 16.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | too rare for a date | ||||||||
| 32°F | May 11 | May 17 | May 21 | May 25 | May 28 | May 31 | Jun 2 | Jun 6 | Jun 16 |
| 28°F | Apr 29 | May 2 | May 6 | May 9 | May 13 | May 17 | May 20 | May 25 | May 29 |
| 24°F | Apr 20 | Apr 24 | Apr 27 | Apr 30 | May 2 | May 5 | May 8 | May 12 | May 18 |
| 20°F | Apr 10 | Apr 15 | Apr 19 | Apr 22 | Apr 25 | Apr 27 | Apr 30 | May 2 | May 6 |
| 16°F | Apr 2 | Apr 6 | Apr 9 | Apr 13 | Apr 16 | Apr 19 | Apr 21 | Apr 24 | Apr 28 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | too rare for a date | ||||||||
| 32°F | Aug 29 | Sep 4 | Sep 8 | Sep 12 | Sep 14 | Sep 17 | Sep 21 | Sep 25 | Sep 29 |
| 28°F | Sep 10 | Sep 14 | Sep 19 | Sep 23 | Sep 26 | Sep 29 | Oct 2 | Oct 5 | Oct 11 |
| 24°F | Sep 19 | Sep 26 | Sep 30 | Oct 2 | Oct 5 | Oct 8 | Oct 13 | Oct 17 | Oct 23 |
| 20°F | Sep 30 | Oct 5 | Oct 10 | Oct 14 | Oct 18 | Oct 21 | Oct 25 | Oct 30 | Nov 4 |
| 16°F | Oct 13 | Oct 21 | Oct 25 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 10 | Nov 14 |
Freeze probabilities 1991–2020 at Babbitt, MN, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 55750 →Compare Hoyt Lakes with another place →
Weather by month in Hoyt Lakes
July is the warmest month at Babbitt, MN, averaging 77°F by day and 53°F at night; January is the coldest at 16°F and -7°F. A freezing night is all but certain in every month from September to May (a 90% chance or more). July is the only month with under a 10% chance of a 32°F night. In spring, June still brings one in 34% of years.
Warmth for growing adds up to 1,529 growing degree days a year (base 50°F), fewer than at 98% of the 142 Minnesota stations. 30% of them (464) have built up by the end of June, and July adds the most, 470. Precipitation totals 29.9 inches a year, most in July (4.4") and least in February (0.9"); May to September bring 64% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 16 | -7 | 1.2 | 100% | 31 | 0 |
| Feb | 21 | -5 | 0.9 | 100% | 28 | 0 |
| Mar | 34 | 10 | 1.0 | 100% | 29 | 3 |
| Apr | 48 | 25 | 2.4 | 100% | 23 | 13 |
| May | 62 | 39 | 3.9 | 99% | 10 | 121 |
| Jun | 72 | 49 | 3.8 | 34% | 1 | 327 |
| Jul | 77 | 53 | 4.4 | 2% | 0 | 470 |
| Aug | 75 | 51 | 3.6 | 12% | <1 | 398 |
| Sep | 65 | 42 | 3.3 | 90% | 5 | 169 |
| Oct | 50 | 31 | 2.7 | 100% | 18 | 27 |
| Nov | 34 | 18 | 1.6 | 100% | 27 | 1 |
| Dec | 21 | 2 | 1.1 | 100% | 31 | 0 |
Monthly normals 1991–2020 at Babbitt, MN (1,481 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Eveleth Wwtp, MN, 22 miles west of Hoyt Lakes, has a last frost 16 days earlier (May 12), a first frost 17 days later (October 1), a season 33 days longer.
When it snows in Hoyt Lakes, Minnesota
The first measurable snow (0.1 inch or more) in Hoyt Lakes usually arrives around October 28, and the last of the season around April 18. Those are the middle dates across the winters of 1991–2020 at Embarrass, MN, 11.3 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 40 days after the last snow.
Planting calendar for 55750
| When | What to do |
|---|---|
| March 19 – April 2 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| April 2 – April 16 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 30 – May 14 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| May 28 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by June 22 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by August 31 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| September 14 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 55750 is 15 miles from Babbitt, MN, which stands at 1,481 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 55750 in zone 3b, the band where the coldest night of the year averaged -35 to -30°F (-37.2 to -34.4°C) over 1991–2020; a zone describes winter lows, not frost dates.
Frost dates across Minnesota →
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.