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When to plant hardneck garlic in Newcastle upon Tyne

How to grow Hardneck garlicNewcastle upon Tyne climate
Where are you growing?

Comfortable

Hardneck garlic in Newcastle upon Tyne is a good fit outdoors. Planted in autumn, harvested next summer (about 7–9 months).

When to plantNovember 28 – January 8

Harvest
210–270 days from planting
Season vs crop
312 grow days vs 210–270 needed
Typical frost (last spring – first fall)
May 14 – November 28

Hardneck garlic in Newcastle upon Tyne is a good fit outdoors. Planted in autumn, harvested next summer (about 7–9 months).

Planting conditions

Hardneck garlic planting activities across the year: Direct sowJFMAMJJASOND~May 14~Nov 28
  • Direct sow
Local activity windows for this place and growing method. Dashed lines are typical last and first frost.
Suitable growing days in a row312
Days to harvest210–270 days from planting
Nov 28 – Jan 8
Direct sow
ActivityWindowNotes
Direct sowNov 28 – Jan 8Plant outdoors in this window.
Based on average frost dates. Adjust a week or two for your conditions.

Planting and growing across the year

Planting is the sow / plant-out window. Growing is daytime air versus this plant’s ideal (17 – 23 °C) and tolerable (−5 – 30 °C) ranges.

Hardneck garlic planting and growing weeks in Newcastle upon TyneJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECPlantingGrowing
Planting uses sow / plant-out rules (frost, soil germination, night, and last-sow): green when plantable, blue diagonal when nights or soil are too cold, amber cross-hatch when too hot, faint for other calendar limits. Growing shows daytime air against this plant’s ideal and tolerable ranges across the year.

Key dates

Typical last spring frostMay 14
Safer last spring frostMay 14
Typical first fall frostNovember 28
Safer first fall frostNovember 28
Frost-free days197
Outdoor sow dateNovember 28
Direct sow windowNovember 28 – January 8
Suitable growing windowNovember 28 – October 5 (312 days)

How these dates are judged

Ideal conditions
Daytime air from 17 – 23 °C.
Suitable conditions
Daytime air from −5 – 30 °C.
Last frost and first frost
Typical spring and fall frost dates for Newcastle upon Tyne, shown in the key dates.
Days to harvest
210–270 days from planting, from typical days to harvest.
Sowing window
Dated sow and harvest bars use frost dates, soil minima, night limits, and last-sow count-back from typical crop timing. The year strip and weekly chart use the same window: air ratings only colour weeks inside it.

Growing window for Hardneck garlic: Nov 28 – Oct 5 (312 days)

Planting window for Hardneck garlic: Nov 28 – Jan 8 (42 days)

Outdoors: weekly temperatures and windows

Temperatures across the year for Newcastle upon Tyne. Shaded bands are this plant’s ideal and tolerable daytime air ranges. Growing is daytime air suitability; Planting is sow / plant-out conditions (same colour language). Window brackets mark each stretch.

JanFebMarAprMayJunJulAugSepOctNovDec−10 °C14 °F0 °C32 °F10 °C50 °F20 °C68 °F30 °C86 °FTolerable -5–30 °CTolerable 23–86 °FIdeal 17–23 °CIdeal 63–73 °FWindowGrowingNov 28 – Oct 5PlantingNov 28 – Jan 8Last frost ~May 14First frost ~Nov 28
  • Ideal range
  • Tolerable range
  • Possible min to max
  • Average min to max
  • Suitable
  • Tolerable
  • Too cold
  • Too hot

Selected week · tap a week or use the arrows

Week 1 · Jan 1 – Jan 4

Average 3 to 7 °C · Possible −2 to 14 °C

Growing: tolerable

Planting: too cold

A week is in range when its average low and high sit inside the tolerance band −5 to 30 °C; it is suitable when that average range also overlaps the ideal 17 to 23 °C band and possible readings stay within −5 °C to 30 °C. Crossing a possible limit, or missing the ideal band, makes it tolerable; a possible low below −5 °C makes it tolerable. When a sowing window is calculated, weeks outside that window are uncoloured even if air is in range.

Based on average frost dates.

Show all 53 weeks
Cover method weekly charts

Outdoor weekly chart is above. Open a cover chart only if you grow under fleece, a cold frame, or an unheated greenhouse.

Other plants for Newcastle upon Tyne

Calculated by Plan & Plant · Method · Data 2019–2026

Frost and suitability dates are typical figures from climate statistics. Microclimates vary; they are not a guarantee.

How we calculated this
  • Data: ERA5-Land via Open-Meteo, cell 54.97, -1.61, years 2019–2026 (not a 30-year climate normal yet).
  • Typical and safer dates: Typical last frost is the date after which half of winters in this sample had no more frost; safer is later in the sample so fewer winters still frosted.
  • Crop rule: Local windows for Hardneck garlic from frost dates, temperature ratings, and crop timing rules.
  • Confidence: Provisional — short or thin sample for this place.
  • Full methodology (algorithm 2026-10-season-6).

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