USDA Hardiness Zone 6b
Frost Dates for 65051 — Linn, Missouri
NOAA 1991–2020 normals from Freedom, MO (805 ft), 6 miles east.
Updated
In Linn, the last spring frost (32°F) is around April 11 in half of years and has passed by April 30 in nine years out of ten. The first fall frost comes around October 21, as early as October 6 one year in ten, leaving a typical freeze-free season of 191 days (NOAA, Freedom, MO).
- Last spring frost
- April 11
- First fall frost
- October 21
- Growing season
- 191 days
- Hardiness zone
- 6b
50% probability
50% probability
freeze-free, 50%
-5 to 0°F (-20.6 to -17.8°C) coldest night
- First snow
- December 15
- Last snow
- February 25
- Winters with snow
- 96%
- Snow per year
- 10.5"
median, 1991–2020
median, 1991–2020
22 of 23 observed
NOAA normal
Frost risk by date in Linn
Half of springs at Freedom, MO see their last 32°F night by April 11; only one in ten is past it by March 28, and one in ten still has one after April 30. Planting tender crops after April 20 leaves a 30% risk of a frost on them, after April 25 20%, and after April 30 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 92% of the 158 Missouri stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 21 in half of years, as early as October 6 one year in ten, and holds off past November 4 one year in ten. A hard freeze of 28°F follows 11 days later, around November 1; in spring the one-in-ten date for 28°F is April 19, 11 days before the 32°F one. The freeze-free season lasts 191 days in a typical year, shorter than at 60% of the 158 Missouri stations; it reaches 212 days one year in ten and falls short of 169 one year in ten. On average 113 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 16 days longer, to about April 27, and return around October 12. Severe cold of 16°F or below comes every winter, usually between December 3 and March 2.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 10 | Apr 15 | Apr 19 | Apr 23 | Apr 27 | Apr 30 | May 4 | May 8 | May 14 |
| 32°F | Mar 28 | Apr 1 | Apr 5 | Apr 8 | Apr 11 | Apr 15 | Apr 20 | Apr 25 | Apr 30 |
| 28°F | Mar 14 | Mar 20 | Mar 25 | Mar 28 | Mar 31 | Apr 3 | Apr 6 | Apr 11 | Apr 19 |
| 24°F | Mar 2 | Mar 9 | Mar 13 | Mar 17 | Mar 20 | Mar 24 | Mar 27 | Mar 31 | Apr 5 |
| 20°F | Feb 20 | Feb 26 | Mar 2 | Mar 5 | Mar 9 | Mar 13 | Mar 17 | Mar 21 | Mar 28 |
| 16°F | Feb 10 | Feb 17 | Feb 24 | Feb 28 | Mar 2 | Mar 5 | Mar 8 | Mar 13 | Mar 18 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 28 | Oct 2 | Oct 6 | Oct 9 | Oct 12 | Oct 15 | Oct 17 | Oct 20 | Oct 25 |
| 32°F | Oct 6 | Oct 12 | Oct 15 | Oct 18 | Oct 21 | Oct 25 | Oct 27 | Oct 30 | Nov 4 |
| 28°F | Oct 18 | Oct 23 | Oct 27 | Oct 30 | Nov 1 | Nov 3 | Nov 6 | Nov 10 | Nov 16 |
| 24°F | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 11 | Nov 15 | Nov 19 | Nov 24 | Dec 1 |
| 20°F | Nov 6 | Nov 12 | Nov 16 | Nov 20 | Nov 24 | Nov 28 | Dec 1 | Dec 5 | Dec 11 |
| 16°F | Nov 14 | Nov 23 | Nov 26 | Nov 30 | Dec 3 | Dec 7 | Dec 10 | Dec 16 | Dec 23 |
Freeze probabilities 1991–2020 at Freedom, MO, 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 65051 →Compare Linn with another place →
Weather by month in Linn
July is the warmest month at Freedom, MO, averaging 88°F by day and 66°F at night; January is the coldest at 40°F and 21°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 81% of years.
Warmth for growing adds up to 3,913 growing degree days a year (base 50°F), fewer than at 66% of the 158 Missouri stations. 37% of them (1,430) have built up by the end of June, and July adds the most, 832. Precipitation totals 44.4 inches a year, most in May (5.2") and least in February (2.0"); May to September bring 51% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 40 | 21 | 2.4 | 100% | 27 | 6 |
| Feb | 46 | 24 | 2.0 | 100% | 23 | 16 |
| Mar | 56 | 33 | 3.4 | 99% | 16 | 74 |
| Apr | 67 | 43 | 4.4 | 81% | 5 | 214 |
| May | 76 | 53 | 5.2 | 10% | <1 | 442 |
| Jun | 83 | 62 | 4.7 | 0% | 0 | 678 |
| Jul | 88 | 66 | 4.5 | 0% | 0 | 832 |
| Aug | 87 | 64 | 4.3 | 0% | 0 | 790 |
| Sep | 80 | 56 | 4.0 | 4% | <1 | 532 |
| Oct | 69 | 44 | 3.6 | 83% | 4 | 247 |
| Nov | 56 | 34 | 3.4 | 100% | 15 | 69 |
| Dec | 45 | 25 | 2.5 | 100% | 24 | 12 |
Monthly normals 1991–2020 at Freedom, MO (805 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, Jefferson City Mem Airport, MO, 20 miles northwest of Linn and 232 feet lower, has a last frost 1 day earlier (April 10), a first frost 5 days later (October 26), a season 7 days longer.
When it snows in Linn, Missouri
The first measurable snow (0.1 inch or more) in Linn usually arrives around December 15, and the last of the season around February 25. Those are the middle dates across the winters of 1991–2020 at Freedom, MO, 6.3 miles away: half of years saw snow earlier, half later. Snow fell in 96% of those winters. The last 32°F night of spring typically comes 45 days after the last snow.
Planting calendar for 65051
| When | What to do |
|---|---|
| January 31 – February 14 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 14 – February 28 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 14 – March 28 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 11 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 29 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 7 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 21 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 65051 is 6 miles from Freedom, MO, which stands at 805 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 65051 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.
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.