Last frost date in Blaine, MN

Average last frost
May 5

The average last frost in Blaine is May 5. By May 21 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about October 2, which leaves 148 frost-free days. An early freeze before September 18 happens one year in ten.

Safe after (10% risk)
May 21
Average first frost
Oct 2
Frost-free season
148 days
Hard freeze (28°F) ends
Apr 25
Next 7 nights in Blaine

No frost in the next 7 nights

Later than usual: the average first frost here is October 2.

National Weather Service forecast, updated Oct 22, 12:24 UTC

  1. ThuOct 2255°
  2. FriOct 2360°
  3. SatOct 2447°
  4. SunOct 2542°
  5. MonOct 2638°
  6. TueOct 2739°
  7. WedOct 2841°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost May 5First frost Oct 2148 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND148 frost-free days
Frost risk through the year at Andover 1N, 7.1 miles from Blaine.

Planting calendar for Blaine

Windows count forward or back from the average frost dates above. Click a crop for dates across Minnesota.

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesMay 12–May 26
PumpkinsMay 19–Jun 2
SunflowersMay 5–May 26
CucumbersMay 19–May 26
CornMay 12–May 26
Sweet potatoesMay 26–Jun 9
WatermelonMay 19–Jun 2
Green beansMay 12–Jun 2
ZucchiniMay 12–May 26
OkraMay 26–Jun 9
PeppersMay 19–Jun 2
BasilMay 12–May 26
Butternut squashMay 12–May 26
CantaloupeMay 19–Jun 2
EggplantMay 19–Jun 2
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesApr 7–Apr 21
OnionsMar 24–Apr 14
CarrotsApr 14–May 19
LettuceApr 21–May 12
BroccoliApr 7–Apr 21
BeetsApr 7–May 19
PeasMar 24–Apr 7
CabbageApr 7–Apr 21
RadishesMar 31–May 12
Brussels sproutsApr 21–May 5
SpinachMar 24–Apr 14
CilantroApr 21–May 12
KaleApr 7–Apr 21
Collard greensApr 7–Apr 21
TurnipsApr 7–Apr 21
DillMay 5–May 19
CeleryMay 12–May 19
CauliflowerApr 21–May 5
LeeksApr 21–May 5
Swiss chardApr 21–May 19
ParsleyApr 21–May 12
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsSep 18–Oct 23
GarlicSep 11–Oct 16
Daffodil bulbsSep 4–Oct 16
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesApr 7–Apr 21
AsparagusApr 7–Apr 21

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 23May 5May 21Sep 18Oct 2Oct 16
Hard freeze, 28°FApr 11Apr 25May 9Sep 27Oct 13Oct 27

Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.

Where these numbers come from

NOAA station Andover 1N (USC00210190) sits 7.1 miles from the center of Blaine at 899 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.

Questions

When is the last frost in Blaine, MN?

The average last frost date in Blaine is May 5, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 21.

When is the first frost in Blaine?

The first frost in fall usually comes around October 2. One year in ten it arrives before September 18.

How long is the growing season in Blaine?

About 148 days between the average last and first frost.

When should I plant tomatoes in Blaine?

Plant tomato seedlings outside from May 12 to May 26. Start seeds indoors six to eight weeks earlier.

Nearby in Minnesota

All 61 cities in Minnesota