Frost dates for 84324Mantua, UT
The average last spring frost in Mantua is May 25 and the average first fall frost is September 26, giving a typical growing season of about 123 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 25
- Average first fall frost
- Sep 26
- Growing season
- 123 days
Safer after Jun 16 (1-in-10 risk)
Possible by Sep 12 (1-in-10 risk)
Last frost typically in 204 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 23 · Jun 10 · Jun 26 | Sep 1 · Sep 15 · Sep 28 | 95 days | 100% |
| Frost / freeze (32°F) | May 4 · May 25 · Jun 16 | Sep 12 · Sep 26 · Oct 12 | 123 days | 100% |
| Hard freeze (28°F) | Apr 17 · May 4 · May 30 | Sep 23 · Oct 7 · Oct 23 | 156 days | 100% |
Planting calendar for Mantua
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 24 – Jun 30 |
| Tomatoes | Transplant outdoors | Jun 10 – Jun 6 |
| Peppers | Start seeds indoors | Apr 24 – May 25 |
| Peppers | Transplant outdoors | Jun 24 – Jul 25 |
| Eggplant | Start seeds indoors | May 11 – Jun 9 |
| Eggplant | Transplant outdoors | Jun 24 – Jul 25 |
| Cucumbers | Sow outdoors | Jun 24 – Jun 16 |
| Summer squash | Sow outdoors | Jun 10 – Jul 25 |
| Winter squash & pumpkins | Sow outdoors | Jun 24 – Jul 25 |
| Snap beans | Sow outdoors | Jun 10 – Jul 9 |
| Sweet corn | Sow outdoors | Jun 10 – Jun 6 |
| Watermelon & cantaloupe | Sow outdoors | Jun 24 – Jul 25 |
| Okra | Sow outdoors | Jun 17 – Jul 10 |
| Peas | Sow outdoors (spring) | Apr 24 – Jun 9 |
| Potatoes | Plant outdoors (spring) | Apr 24 – Jun 24 |
| Onions | Start seeds indoors (spring) | Mar 13 – Apr 9 |
| Onions | Transplant outdoors (spring) | May 11 – Jun 9 |
| Broccoli | Start seeds indoors (spring) | Apr 6 – May 10 |
| Broccoli | Transplant outdoors (spring) | May 11 – Jun 9 |
| Broccoli | Start seeds indoors (fall) | May 27 – Jun 6 |
| Broccoli | Transplant outdoors (fall) | Jun 26 – Jul 7 |
| Cabbage | Start seeds indoors (spring) | Mar 27 – Apr 24 |
| Cabbage | Transplant outdoors (spring) | Apr 24 – May 25 |
| Cabbage | Start seeds indoors (fall) | May 17 – Jun 16 |
| Cabbage | Transplant outdoors (fall) | Jun 16 – Jul 17 |
| Leaf lettuce | Sow outdoors (spring) | Apr 24 – Jul 10 |
| Leaf lettuce | Sow outdoors (fall) | Jun 16 – Aug 2 |
| Spinach | Sow outdoors (spring) | Apr 17 – May 31 |
| Spinach | Sow outdoors (fall) | Jul 3 – Aug 7 |
| Radishes | Sow outdoors (spring) | Apr 24 – Jun 14 |
| Radishes | Sow outdoors (fall) | Jun 16 – Aug 17 |
| Kale | Sow outdoors (spring) | May 11 – May 31 |
| Kale | Sow outdoors (fall) | Jun 9 – Jul 17 |
| Carrots | Sow outdoors (spring) | May 25 – Jul 10 |
| Carrots | Sow outdoors (fall) | May 17 – Jul 2 |
| Garlic | Plant outdoors (fall) | Sep 16 – Oct 17 |
Where these dates come from
ZIP code 84324 is matched to the NOAA station Eden-Liberty, UT, 18.8 km away, at 5,195 ft elevation (11 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Eden-Liberty, UT (used) | 5,195 ft | May 25 | Sep 26 |
| Brigham City Waste Plt, UT | 4,240 ft | May 5 | Oct 5 |
| Logan 5 Sw Exp Farm, UT | 4,488 ft | May 12 | Sep 28 |
| Logan Radio Kvnu, UT | 4,475 ft | May 8 | Oct 2 |
Frost dates near Mantua
- Brigham City, UT 84302 · last May 5, first Oct 5
- Paradise, UT 84328 · last Apr 30, first Oct 16
- Willard, UT 84340 · last Apr 21, first Oct 23
- Wellsville, UT 84339 · last May 12, first Sep 28
- Logan, UT 84322 · last May 12, first Sep 28
- Hyrum, UT 84319 · last Apr 30, first Oct 16
- Corinne, UT 84307 · last May 5, first Oct 5
- Bear River City, UT 84301 · last May 5, first Oct 5
Frequently asked questions
- When is the last frost in Mantua, UT?
- For ZIP code 84324, the average last spring frost (32°F) is May 25, based on NOAA 1991-2020 climate normals for the Eden-Liberty, UT weather station. There is a 1-in-10 chance of a frost after June 16.
- When is the first frost in Mantua, UT?
- The average first fall frost (32°F) is September 26. There is a 1-in-10 chance of frost by September 12, so tender plants are at risk from that point on.
- How long is the growing season in 84324?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 123 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.